If a coach is quietly telling B that A is waiting for the roll and won't expect a ledge-jump, or something, then A has no awareness that the game-state has changed, giving B free opportunities to recover that he would not have taken advantage of before.
Nobody knows the future.
You can guess the future based on probability, which is what we are doing in smash, constantly and all the time. Every action gives us information to the probability of our opponent's next action. If you don't believe me than you probably aren't good.
Coaching in the form of telling people probabilities is ineffective.
If your mind is on one track calculating probabilities, calculations where we are probably making on avg at least 5 decisions/second, I don't believe that if someone tells you their calculation that you will be able to fit it in INSTANTLY into your calculations and use it effectively. So the idea of "do it now!" coaching is wouldn't even be effective. It's not even possible to fit it in instantly either, there would be a delay between the coach's thought of the game, converting those thoughts to words, speaking the words, the person hearing the words, converting the words to smash thoughts, and then executing them.
If I'm wrong then give me an example where it actually happened. Not theory, I want experimental data.
If you want to talk about telling them habits for future reference then think about this. Every habit is met by another habit. If people have a habit of teching towards the center its because the other person has a habit of hitting them to the ground so the tech habit occurs. This means habits your coach tells you is two fold, he has to tell you what your opponent is doing and he has to tell you what you are doing to provoke it.
Let's say your coach manages to do that. He's identified that when you jump at him he wave dashes back. Alright, think about this. How many good players react to every jump the same way? None, right? It depends on a lot of factors such as the angle the jumper is falling at them, the position before the jump was initiated, frame advantages, the "stance" the grounded person is in (running, standing, crouching, shielding), even things like percentage, stocks, and time can influence that decision. The likelihood the coach has identified all of those factors AND posses the language ability to describe such an abstract concept AND that you understand it AND that you can implement it while still continuing with the calculations you are making at the time is so small it is negligible. There is a much greater chance that information would mess you up.
Okay, so that's a little deep. If you're not good at this game it won't even make sense to you because you don't understand how angles, frames, percentage, and hundreds of other little details that can't be put into words affect decisions. But for fun let's look at a more basic example. A Falcon d-throw tech chase on a spacie.
Falcon d-throws, predicts a tech in place and goes for the stomp, the spacie techs in. It happens several times and the coach tells you he always techs in. Next time goes to punish the tech in and hits it, takes a stock.
Can you prove that the Falcon player didn't know this information before the coach? Ok, so to cover all bases lets say the coach did know this information before the player. Is there any chance he could be wrong? Of course there is, it could just be mindgames by the spacie player, he's been conditioning his opponent to expect a tech in so he can switch his tech when he notices a change in behavior in his opponent tech chase movement (people do this btw, if you think i'm wrong you're bad at this game).
Alright alright so just to make sure I don't miss anything, lets say the coach was right, he accounted for all the mind games, overcame the barrier of communicating the idea and his player follows through and he is right. So, did the player know this? No, the whole argument is that the coach is thinking for the player. So if the player didn't know this but he decided to have faith in his coach's decision, is the player actually playing better or is he gambling? He's taking a risk, he has faith that his coach is correct. Let me make it clear that faith DOES NOT equal skill.
One might say, "Well Forward the problem with that is that the Falcon is not playing against his opponent he's playing the coach. It's supposed to be a one on one fight."
Well it is a one on one fight, it's the player vs the coach because the player isn't doing the thinking. If you're not happy with that, let me ask you this. What would you expect to be a more difficult opponent, a single opponent whose mind is controlling his hands or a an opponent whose hands are being controlled by a mind being controlled by another mind? All I see with the coaching scenario is a delay in execution on my opponent's part that is gonna make the match a breeze.
So far I haven't heard any evidence that this sort of "do as I command" coaching is even remotely effective. Coaching examples there brought up have been skewed from the truth to support their opinion. Dr. PP came in and said he didn't hear any sort of advice from his crew in the example that involved him. Lucky said that HugS wasn't tactical advice but telling him to calm down and regain composure.
In fact, all evidence would point that it is not effective. Go beyond the surface level of "my opponent has people making decisions for him" and think about what that means and you'll see it is illogical to believe that that is helping him or that that is even what is going on. How many of you have ever tried to tell a lesser skilled player what to do in a given situation and they reply "every time I try that he does (thing that beats it)!" I've heard it a lot.
If you think it is wrong that player can't have a close friend sitting next to them telling them to keep up the good work, calm down, relax, you got this, good job, then not only are you ******** but you are sick and cruel.
The crowds argument still stands. Smash history is filled with more upsets caused by crowds than by coaches. I'm sure those stories are a dime dozen. Anybody can tell you of a time a crowd got to them and made them play worse or a crowd cheered them on and they played well.
Seriously, ask yourself this question. If you had to go up against your closest rival and you had the choice between a crowd of 50 people filled with friends and family cheering you on and saying awesome things to keep your spirit up and a coach whose going to tell you which way the other guy is gonna tech and if he's gonna recover high or low which would you rather take? I don't know about you guys but I'd say the choice is easy.