And you also have to remember the Hardware that BOTW has to run on. BOTW had to be developed first for the WiiU, then ported to the switch. And either one of those consoles are not really considered "Next Gen" or Current Gen, Hardware wise anyway.
The game is still HUGE in size, and yet there are barely any loading screens when traveling from location to location on foot. Just imagine there were 10 to 15 huge dungeons like in OOT, with tons of puzzles, and secret locations.
You have to ask yourself, "Would the Hardware of either console hold up?"
If it was released on PS4, XBONE, or PC? Sure it would. But it's a Nintendo exclusive, and Nintendo is not known for thier Powerful hardware in thier consoles now a days.