Well the first part makes sense, the second part of your statement however has an error. If you can already predict that you will get hit, that's it; there is no more prediction involved. I'm not sure why you think there is prediction involved in pure timing. Projectiles are not unpredictable like players, they cannot change in nature. The are not mutable, they will always act the same: Speed, distance, size, damage, everything.
While Powershielding is more difficult than L-Cancelling it's still always an optimal choice and always yields a desirable result. (I'll repeat this as many times as it takes) Just as L-Cancelling's extra button press is arbitrary, so is the specific timing that Powershielding demands. It's pure tech skill that adds absolutely no mental depth to the game. I repeat, Powershielding does not add any mental depth to the game that regular shielding does not already offer. The specific timing Powershielding calls for beyond the prediction already present with regular shielding only adds more artificial difficulty, as in pure technical difficulty for the sake of being difficult.
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THERE ARE TWO TYPES OF POWERSHIELDING:
POWERSHIELDING WHEN YOU HAVE TIME TO REACT
POWERSHEILDING WHEN YOU DON'T HAVE TIME TO REACT.
IN THE LATTER, YOU HAVE TO PREDICT WHEN YOU ARE GOING TO GET HIT. PLEASE READ MY POSTS HOLY !@#$.
You keep saying "it adds no mental depth" over and over and over and over and you keep ignoring the part where I explain why it does. The entire game isn't one player sitting in a corner spamming samus missiles. 90% of moves thrown out in competitive play (while both players are in neutral) come out so quickly you cannot react to them. Let's say there is a mario in front of you and is most likely about to hit you.
Is he going to jab you? (frame 2)
Fsmash? (frame 12)
Down-tilt? (frame 5)
Nair? (frame 7)
Retreating back air? (frame 11)
D-smash? (frame 3)
Grab? (frame 7, can't be shielded)
Any of these could come, and none of them can be reacted to. Let's say you think he's going to do a retreating bair and want to powershield it, so you time your shield and guessed correctly! Now you can instantly shield drop, dash, and whack him out of the air while he's in lag from bair. Now, let's say you guessed wrong. You delayed your shield to powershield bair, but it turns out he decided to downsmash you and you died.
Well, let's say you decide he's going to downsmash, so you throw your shield up as quickly as possible. If you guess right, you punish his downsmash. If you guess wrong, a retreating aerial will let him safely pressure your shield with the potential threat of b-reversing a fireball right back at you making you second guess dropping your guard. You didn't get hit, but you are now at disadvantage.
So, for mario, the safe play is to do a retreating aerial, but if he takes a risk with a dsmash, he can net a kill. The safe play for you is to try and PS the downsmash, but it will likely put in slight disavantage. If you take a risk and try to PS something else, you could die, but if you are right, you get a punish. Oh, but he could also grab you, so maybe you should just spotdodge?
That's a lot of decision making to go through in a few frames, isn't it? If you ignore my point again, I'm done replying. I am completely out of new ways to explain something simple.