FrogReaver has been commenting that the powers are too similar cross-class as I understand him. With luck it will show people there's more to the game.
And at will and cool down powers is a pretty good way of describing 5e characters. I've never understood what makes pacing yourself supernatural - indeed these untiring warriors who can always make the same attack with the same effectiveness are to me second only to hit points in making other editions of D&D feel far more gamey than 4e. And I find the wizard spellbook and complete retools this allows obnoxious. And their need to memorise and complete lack of mastery of their magic counter-intuitive and a massive constraint on worldbuilding.
Does it have to be AEDU for fighters? No. But at least AEDU isn't spammy - something I find you can only really get away with by making combat fast.
Did it have to be AEDU for wizards? No. But AEDU I find fits just about any fantasy setting with reliable magic that's not explicitly built round D&D tropes (and even some explicit D&D settings) better than Vancian Casting.
Could they have done better than "hard" AEDU for everyone if they'd been allowed to delay 4e when they went back to basics 10 months in and had only fourteen left to finish the whole thing? Probably. I think I did in my retroclone (AEDU is still a thing, but the Archivist Wizard is almost all D, while fighters can be largely but not entirely A if they choose).
But AEDU makes characters feel a lot less "one note" to me, whether they are martial characters or spellcasters. There's a good reason the 5e characters I gravitate towards are the ones that actually have much more variable pacing and approaches and, perhaps as a consequence, have effective short rests - the warlock and the monk.
Which means I guess what I'm asking is why is everyone using AEDU considered more samey than almost everyone being AAAA!!! or DDDD: ? Which admittedly 5e has mixed up a bit.