Aaalright. Here are the points I've come across that struck my attention. If your point isn't listed below, my answer is simply 'well duh, that's exactly why they removed it'.
-It's also always better to powershield instead of shielding
We advocate that L-cancelling should be 'automatic', and we do not advocate that powershielding would be 'automatic'. Have you ever wondered why ?
Making every shield into a lagless powershield would be a terrible thing. Making every aerial lagless does not just fasten the game, it also produces new combos and makes the game, from a subjective but valid perspective, better.
So the real debate is 'should we put technical barriers on things that make the game better ?'
And the answer to that is up to you. But Nintendo's answer is pretty clear to me, and I actually agree with them for once.
-More difficulty = more good
Okay. So let's say you have to press the jump button for exactly 5 frames to do a short hop. Less than that and you don't jump, more than that and you full hop. See, the game is much harder now. People will eventually get to a point when they are able to consistently short hop. But does it make the game better ?
It adds unpredictability due to players being lame, instead of adding it by adding more ways to outplay your opponent. That is a very negative way of viewing it, and the overall experience will be terrible. Things like this are the reason in many games have a very elitist community. League of Legends is a prime example of it : up to like 1600 elo, you are not outplaying anybody, they are just being more lame than you. And the community for this game is a complete disaster.
Nintendo is very aware of this game designing creed. Their philosophy aims at making their players feel good about themselves. And idk about you, but this is one of the reasons I play Smash over, say, Street Fighter.
-The opponent has a thing to say, by angling his shield in example.
That's actually a pretty good point.