Thats a great idea. I really think CDPR should expand on the best strength of this game which is the characters imo, given that they are all not given that much screen time.
Agreed. To have written such great characters, and then drop interactions with them completely after their final quest feels very strange. In many cases this happens barely halfway through the game, and you won't see/interact with them again unless you romance them and get a specific ending.
There should be ways to continue interacting with them dynamically. The suggestions from games like AC Valhalla or even from what I've heard with GTA are good places to start.