They’re waiting until BOTW2 is playable... because it’s going to be a launch title for the new Switch Pro or whatever.

“Unless you elect to play the Steam version of Dragon Quest XI on my home PC at 1080p and 120 frames per second (or 4K at 60 frames per second) for about a hundred hours before starting Dragon Quest XI S for the Nintendo Switch, you might not have any complaints about the graphics.”