That's correct and a very good point. However, that would only be the exact case if your desired outcome also didn't result in a worse narrative. There are many examples, but I've already listed them a couple of times, so I'll just focus on one. Depending on what you did first, Yumi may resist Nodoka's blackmail or not. You can say "well, I'd rather have a timeline where Yumi wasn't sexually assaulted by Nodoka", I don't mind "missing" whatever would come from that because I'd rather have a world where it didn't happen at all. That's perfectly acceptable in theory. But the issue is that Selebus wants to tell a story where it happened.
If you have the blackmail not happen, then Yumi reacts to Nodoka and especially Akira in a way that borders bizarre. Akira would have literally found her in the baths, offered his shirt to her, she'd have rejected it for god knows what reason, and that would have been it. It makes no sense for Yumi to despise him in the same way from both "I can't believe you'd have sex with Nodoka when you already have Chika" and "I can't believe you'd watch while someone sexually assaulted me without doing anything, and then go on to cum in her mouth in front of me".
I agree with your point in theory, and hey, I can only speak for myself, but I couldn't care less how someone else chose to play the game. Miss everything, miss nothing, even if they chose to stop playing because they bought into the "you're responsible for this since you didn't stop playing" thing, I think that's a valid choice. But the issue that I see is that the story is worse if you miss events, not because there's a canonical path, but because Selebus doesn't put enough effort in following through with his alternate choices. Maybe he changes that when the game is finished, that'd be nice.