>And any game that "does" have this content "must" be a shit game by default
No, "must" implies absolute. Games being usually shit if they're horny-bait is a correlation, not causation, because that's usually the reason the developers make it horny bait, it's usually to entice players to play the game, not out of some artistic love for the medium and just genuinely wanting to see huge asses like that developer/animator we had in 8prime. Just look at all the Korean MMO bullshit with characters, shitty gachas, some eroge, etc.
And I don't mean "Oh, it has jiggle physics, nice!", I mean shit like women's asses being gigantic, wearing skin tight suits, and stuff like that. Basically porn, but with game mechanics.
A good game can arise while still having those? Yeah, sure, but a lot of things go into games to make them more attractive for new players, to get them bought, and one of those things is lewdness. I just find lewdness to be very basic and uninteresting, and because of how much it hacks our primate instincts, it almost feels like cheating.
>Now personally, I disagree with this take. If a game is good, what exactly is the problem with including fanservice in the title?
This is backwards, if the game is good, it does not matter if it's horny bait or not, you're already playing it because it's good.
If Senran had absolutely shit gameplay, you'd still manage to play it for the art and lewdness because it's charismatic and has a clever story, but as you reduce it all to the point it's just jiggle physics, huge tits and nice models, and everything else is generic, then the game is just a vector for porn and it should be judged as a bad game.
A game like that is just horny bait, it still attracts people because it's horny bait, and because horny-bait is a lot easier to achieve than making a good game, there's just a clear correlation of bad games still managing to be horny bait and attracting players based on that, and again, if your only defense of a game is that the characters are hot, then that's just a shitty game.