I do tend to agree with you that most if not all of the characters in AJLT are undeveloped - even old characters like Miranda - but that doesn’t negate the fact that Che in particular got A LOT of screen time and it feels like the
only reason we’re meant to care about them is because they identify as non binary. It also doesn’t make sense that after Miranda and Che were no longer dating, that Carrie would continue to care about Che
It’s just such lazy writing and attempting to shoehorn in characters for box ticking purposes. It sucks.