Obviously, I disagree. More content is always better than less and more content is better than 3D graphics.
Ah, well, in that case, I'm not sure going "back" to 2D sprites is going to sell (considering we've had 3D rendering since the DS era, to some varied extent).
But yeah, I also disagree on "more content is always better".
to me this is like saying "I don't get the appeal of having 30 civs to play instead of 10", it is self-evidently better to have all the pokemon available in the game as far as I'm concerned just as more civs in a civ game is self-evidently better.
I don't care about completing the pokedex, as I said my concern is the ability to have all my favorite pokemon on a team, which is literally impossible when a bunch of those pokemon aren't even in the game.
So there are two aspects to this. One is "more content is always better", and another is the target audience for a video game.
30 civilisations in a Civ. game doesn't affect me for two reasons. Firstly, I can choose what civilizations I play against, in every single game. I can limit them or restrict my AI opponents in a wide number of ways. I can turn Barbarians off. I can disable victory types. The entire concept of 4x play and how Civilization (nevermind other 4x games) has evolved is wildly different to the player choices in a relatively linear game like Pokemon (albeit with an increasingly "open world" exploration aspect).
Like, I could write an essay on this. But the ultimate decision, imo, in the eyes of the developer, are the options they give the player. A single-player playthrough in Pokemon has historically
never been challenging. Not really. The challenge is in the competitive scene, which is very different (and far larger) than the one that exists in Civilization (or other 4x games). To that end, the choices the player makes are heavily curated, vs. the "every choice is impactful" ethos that pervades 4x games, from the pre-game setup stage throughout the actual gameplay itself.