I think it would be very hard to return to BotW at this point.
I'm honestly having the opposite impression. I adore the bounty of quality of life improvements, new mechanics, and expansions of the map, but I still find myself feeling like I'm more likely to do a replay of Breath of the Wild over this, in the future.
I agree that the building feels like a gimmick, and while it's very entertaining seeing the insane contraptions that people are coming up with, it's just not really grabbing me very much as a feature. And a healthy amount of the loot you find is stuff meant to facilitate playing with that part of the game, which makes a lot of the rewards feel pretty much worthless.
I like that something like 'weapon crafting' was added to Breath of the Wild's template, but I'm irked that it's come at the cost of practically any weapons you find on the surface being pretty much garbage. I know I can
make a fire wand or a lightning blade, but I realize that I'd much rather find them in chests; instead I find a lot of Zonai charges. I know the weapon durability has always been a contentious mechanic, but it didn't bother me in the first game. Maybe it's because weapons were always abundant, I'm not fully sure. In this game, though, viable weapons are typically created by sticking an item onto a crappy weapon, and using it will eventually break the attached item. This results in me being extremely hesitant to use any of the drops I get from monsters for this purpose; a case of the classic "I'll wait until I really need it" curse that feels common for a lot of consumable items in RPGs.
The abilities granted for clearing the major dungeons have also been misses for me. Even if the new Rito ability is extremely useful, I used Revali's Gale so often in the first game that its absence here is almost constantly felt. There are substitutes but they all either involve so many more steps, or simply lack the same utility. Beyond that, though, the way you activate the Sage's abilities can be frustratingly inconsistent. You have to talk to their spirit by pressing A. Much of the time I find myself doing this on accident while trying to pick up items, causing them either to be blown far away, or lit on fire; and much of the time when I
do want to use one of their abilities, they're fucking around somewhere else! I was very upset when a Hearty Truffle I was planning to pick up got cooked.
The Hearty Truffle being tragically cooked stings that much more because of the absence of Hearty Durians. I know it was cheesy to have maxed out yellow hearts near the beginning of the game in Breath of the Wild, but it still made for a more relaxing experience exploring the world if that's what you were after. That option isn't here in Tears of the Kingdom. There are still "Hearty" items but they are far more sparse. Again, I can't exactly blame Nintendo for this sort of balancing decision, but it's definitely something that makes a replay of Breath of the Wild over this more appealing to me in the future.
I'm still enjoying myself though. It's quite fun, if a bit disappointing.