You may be alone by choise when gaming, but MC is living in a game world with babes
Why would you not let MC just have somone by his side in this game? Why?
There's a huge difference between choosing to be alone, and just wanting the option to avoid specific LIs.
Not every potential love interest in every game is going to tick off every box for every player. Some girls are going to be a huge turn-off (whether from looks, personality, or in-game circumstances), and players tend to like the
option to say no to someone they don't really want to be with.
Forced scenes tend to take all choice away, and lean more towards kinetic novel than game. Which is fine if that's what you're into, but a lot of players aren't.
I mean, in this game (or games like Three Rules of Life) I'd be more inclined to want to be able to reject the destined One True Love Interest presented in the backstory in favor of pursuing new love interests, and if it feels like a game already knows exactly who it wants me to be with (and tends to force scenes and choices along those lines), I'm going to be annoyed. Especially if it starts to feel like any choices or decisions that don't further the One True Romance are going to lead to bad endings.
I've definitely rejected LIs in games before. But I can't think of a single game where I didn't wind up with at least ONE of the options. I never really "chose to be alone". So choice isn't a binary "everyone/no one" scenario.