IIRC it is actually a different physics engine than BotW. BotW couldn’t handle all the physics interactions in TotK. That’s what’s so impressive about the game. Physics-based games are rare, especially for AAA-developers, because it’s just a lot of work. In TotK everything just works as you’d expect. You’re just looking at it from a gameplay perspective while ignoring the technical achievements.
I can’t help but respect spy mains because they play by far the weakest merc in the game. If your team has a somewhat competent pyro on spy duty they don’t get to do anything.