Really excellent points. Argument/opinion: re: Bella romance path, I think by the time of the morning after MC officially becomes a DIK and Bella knows he will no longer be staying with her, Bella's almost Vulcan-like logic is fighting a losing battle.
She is totally smitten with MC. The call she makes from the gym is even visually presented well saying just as much as her words. The Vulcan-like logic still pops up occasionally but each time it is defeated by not just lust, but love. I think she is being as honest and true as she can be to her feelings, whatever that means in regard to human nature.
Of course, DPC gets the final say on the story along with multiple possibilities of one playing a particular goal they want for the MC in the game.
I think this is just one of many examples of DPC crafting a good story.
To me Bella hardly ever gives the impression of acting rationally, she is always over the top.
even at the beginning she always reacts very excited to Tybalt's presence, to Mc calling her "Bella", to the nerds making noise in the library
even in the most intimate moments, for example when Mc tells her his story, she always starts off aggressive, always full of prejudice and only with time does she calm down
always with all the risk that one runs in judging "normally" a fictional character, to me Bella seems a wild person, unaccustomed to normal social life, maybe because of the trauma of her marriage or of what put it in discussion, maybe because she had to defend herself afterwards from unwanted advances (like those of Burke and probably of other students). She seems to me a person who lives much more by instinct than by reason (the instinct for which she hates Tybalt, for which she judges Mc to be unsafe but then remains fatally attracted to him, the instinct that leads her to a completely risky move like going to the Diks' and then even staying overnight there, as a counter-example Quinn who, because of the dangers of her life, leaves in the middle of the night).