I completely agree with all of this but I would add a few more specific points

Romantic interest or "High Approval Platonic" relationships should have unique cutscenes at the pre battle get together

That these above relationships have some reactivity beyond the random click animations during parts of the Final Battle - as in those members you take with you are literally your ride or die companions. I think we should show them some extra love in cutscenes no?

I can not agree with Point 1 more. Companion quests end very very quickly into Act 3. It leaves the world feeling very empty even though there are so many side quests, we are invested in these characters and thus feel the connection to the world through them.