>>39130201Though those games also weren't a mainline game where bringing your bros in was super relevant. Being spin-off titles game them a lot more freedom to use partial dexes without people freaking out, and thus they WERE able to put more effort into the rest of the game.
SW/SH, being a main game, it's much more important that they can support the entire dex for those wanting to transfer their 'mon to the next game as they've constantly done so far- doubly so with the literal trap that is Pokemon Home as a subscription service.