ToTK proves Switch hardware isn’t holding back gameplay or grand designs or huge worlds. What the new hardware will do, is fix what they can’t do with current Switches. Get optimal performance and modern graphical features and IQ.
I'm always going to push back against this idea.
When you chop down a tree, walk twenty metres in one direction and then come back to find the log has disappeared, that's the Switch holding the game back.
When you build a vehicle that reaches 90 miles an hour and the game ejects Link from it, that's the Switch holding the game back.
When you engage in the near infinite possibilities of physics in shrines, but then enter a cave and do binary, scripted puzzles regarding the water level that are limited and do not feel "real" within the world? Switch. Holding the game back.
All the light puzzles involving straight, unbreakable, infinitely extending shafts of light? Well, you know...
Let me further ask this: Do you think, if they had the power, these devs wouldn't consider destructible terrain or collapsible structures, given the interaction possibilities with the mechanics they've already created? That they wouldn't want to write the physics large on the landscape, to allow you to destroy dams in the sky to create rivers and lakes in the ground a kilometre below? That they wouldn't create a weather system in which oncoming storms can be seen from a distance?
All of these things would impact gameplay. The limit placed on open world Zelda is absolutely technical.
And that is focusing just on a very narrow definition of gameplay. The Zelda team care about how things look, about the atmosphere the game has.
Imagine you go to the Depths and you throw a light seed and walk away to explore. And those little beetle things come out to eat the seed, and as they get closer to it, you see their skittery shadows projected across the entire landscape. That's not nothing. The interplay between light and shadow seems to be a major idea behind a major component of the game.
And frankly, I think the game not diving to like 15fps at times when you use Ultrahand would count as a gameplay improvement in itself. It feels bad. And this is coming from a Switch-only player who rarely cares about these things. I don't even have a 4K tv.