the thing nobody says about writing a two protagonist story
if both of them are equally important then neither of them can have a secret from the player. you see both sides. so the tension cant come from what one of them is hiding from you, it has to come from what theyre hiding from each other while you watch both
thats a really hard thing to write and its the exact opposite of how gta v used it, where switching was mostly a mission tool. its also why i think the switching is going to be restricted in ways people are not expecting