I don't mind them changing things around, but i think the part of traveling and exploring a new region is a very important aspect of the franchise.I can appreciate a change in writing style when it's done right, but I think that the anime has made it this far because it followed a predictable pattern. So getting back to basics in the Galar saga still sounds more appealing to me than seeing a more experimental kind of storytelling.
IMO, having the characters stuck on the same place for that many episodes hurt the show as a whole.
I know them joining the school was supposed to be relatable for kids who have to go to there everyday, but it failed in that regards because the school felt nothing like a real school and more like a really long summer camp. They could've used that scenario as an excuse to make Ash learn so many new things about Pokémon, the history of Alola and etc, yet more than half of the scenes in the school just had them babbling and doing nothing. I guess they had a school presentation and some excursions every now and then, but that is about it.