Graphics is not the thing I prioritize the most about Pokemon, but if I see GameFreak cutting corners everywhere else (less features, less postgame, less battle modes, LESS POKEMON...), if I don't see an improvement in something, anything, to compensate, I will call them out. I was understanding with the jump between BW and XY, because the 3D jump was a big leap, so it was understandable at the time. Now, with the trend continuing for multiple generations and absolute no sign of improving (in fact, it's becoming worse), I am much less charitable.
They have no excuse: they have enough resources to make it work, they win enough money to justify hiring more staff if they need help (plus they could ask other Nintendo studios). The Switch is powerful enough to show absolutely gorgeous stylized graphics, so it's not a hardware constraint. Hell, I am one of the few people who would rather go back to 2D if we get enough worthwile content. GameFreak has been going on a downwards spiral ever since The Pokemon Co. hit gold with Pokemon Go, which has dwarfed their own profits for the company, and they are cutting corners to try to catch up to an impossible standard.
Plus, who thought having the entire game in Luminose City was a good idea?? Seriously, why?? At least Arceus had you explore a world, this is just putting mons randomly between buildings, I cannot believe how transparently lazy this choice is.