Petty "gen wars" amongst 3/4/5/6/7 are so silly and pointless. All of these gens are part of the same universe and I enjoyed each and every one of them. You can transfer your bros from RSE to USUM and everything in between, keep the unique tutor moves each generation and whatever else you want. But gen 8 onward is a new separate universe where they remove features, retcon movepools, delete certain moves from the game entirely, and of course shrink the pokedex. Continuity was utterly disrupted by gen 8 in a way that it never had been before. I'm not hopeful for gen 9 either, based on what we've seen so far.
P.S. - gen 1-2 are classics and thus immune to criticism.