You know whats funny? For a solid 2/3 into Act 3 I thought a secondary approval bar would load for every companion
Why? because that might mean unique scenarios to the *end of the world looming on the horizon* or major reactions/ choices they will make based on how you complete the game

Can you imagine? You hit 100 approval, finish the main component of the companion quest and then there is a small mini approval bar (probably 3 stages or 4 at the most given the run time left in the game in reality) and depending on choices with I dunno *the remaining 2 villians and giant battle* if you fill those up you get 3 hidden cutscenes
That would have been such a cool thing to do! and, you wouldnt even know how to unlock them, it remains a mystery.