Why would you even WANT to rep Sheikah Slate abilities? 2 of them would suck as Smash abilities. And Link already uses one of the other 2.
Replace Link's FS with one where he Stasis the opponent, then spin attacks them 10 times before sending them flying off screen and you've repped every decent slate ability.
Because they're the backbone of a huge amount of gameplay in BOTW.
Link shouldn't have used any anyway, as he's a very weak representative of BOTW due to not being allowed to much change it up at all(as no characters is allowed to massively alter their playstyle). Completely changing him up even more would've been even worse than we already have, making him impossible for people to adjust to(and he's already difficult enough for some to adjust to. Losing the Gale Boomerang is a fairly big deal).
All should be represented as much as possible, and there's just better characters to do so. It's the actual core use of anything close to magic in a playable setting(which is why it's been suggested for Zelda before. And Impa by virtue of it being literally being part of a logical option. She's a Sheikah, after all).
We have Bombs(which aren't what Link would've used anyway, as Remote Bombs isn't a normal Bomb, but basically recreated for his new Down B only to match the Sheikah Slate), Cryonis(which can be used in a multitude of ways that isn't just a platform. Freezing characters isn't a common ability among any but one Smash fighter), Magnesis(which can be more than just a throw), Stasis(which is more useful than just a quick throw option. Stunning abilities are not actually common), and those are the most core ones. The summons it can do aren't really notable in terms of Smash, outside of a taunt. Nor is the Master Cycle. Can't do much with a Camera or Map function, though. Besides Taunts.
Coupled with various other abilities Impa or Zelda could have, and you have a much stronger use of it compared to the lackluster usage of it from Link, who isn't, again, allowed to do much with it. The throw isn't ultimately much better than losing a tether recovery(and his Final Smash is even more boring, since it's not one created more for him but a quick reskin). Besides that, you really cannot easily apply the leftover abilities to Link without overly changing his playstyle, making him a bad choice as a veteran to try and paste it onto. Those would've worked more than fine for a newcomer instead. And all of the abilities listed are actually pretty easy to transfer over in different ways, with only Cryonis requiring a tad extra work in the best way to use it. The rest? Pretty good for what their purpose is. And any leftover abilities like Map, Camera, Summoning are pretty easy taunts, so using all of its abilities(before TOTK) is very easy to transfer over without any issues. And make them work fine. They just don't work well as Link moves(with only Remote Bombs being an actual decent change that makes sense... since it's already a thing Link can do in other games, being the Oracle games and MC. And probably others I forgot, but they are immediately on the top of my mind for it).
It didn't help that Tekken was on Sakurai's radar since Smash 4, as Heihachi Mishima was planned as a DLC character but was scrapped and turned into a Mii Costume instead.
Considered. He was never planned to be in the game.
Ascension seems like it could be a really fun Smash ability based on this mod:
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The Tears of the Kingdom abilities translate pretty well into Smash attacks too, though many of them are projectiles.
To be fair, this is referring to the BOTW stuff only, since it's referring to Smash Ultimate stuff. But yes, they should've just stuck with a few BOTW weapons instead of poorly using the Sheikah Slate and saved that for a new character in the next game, or at least use a new character who could be way more interesting with it. It's an excellent tool full of capabilities, and it doesn't need to be one move each. Using Magnesis-based metals as different moves is one of many ways to go about it~
That said, BOTW Zelda as a unique character with the Sheikah Slate and Champion Abilities does sound pretty awesome. Being that the Remote Bomb wouldn't be a Down B since that's used differently, how would you set it up?