Hey... you want DPC to bring us additional 4-5 Interludes for each MG?
The things you described not even secondary, they are tertiary, imo.
You want to figure out about hobbies, etc, but it's characters past and background mostly and most of the time. Here and there from time to time you will learn the really important moments about each character (MGs/SGs), but all those stuff you mentioned may eat a lot of episode(s) space and I doubt it will worth it, finally.
I mean... look at the other games of genre, look at the other media like movies, etc. Even in TV series, where you are not limited with a 1.5-2.5 hour of screen time, but have a bunch (8+) episodes and seasons - even there we don't see so much about characters past, because it could be boring and doesn't worth the wasted screen time. Some flashbacks, etc - yes, it became a trend from the LOST TV series I suppose. It was genius and works quite well.
What benefits you will get from learning what hobbies Josy had/have, for example? I think she is the only person with the least and minimum background info available at the moment, including her hobbies, etc. But... I suppose it's because she appeared as a permanent and full-fledged character only from the EP4. We learned a lot about Maya, Jill, Bella, etc at the same time, but Josy was a "guest star" for a whole 3 episodes. What's happened next? In EP4 MC avoided meeting them (J&M), then... we have a library conversation which ends up as a throuple or friends. Then... EP5 - it's similar to EP9 - 80% of episode was occupied by preps party. So, only starting from EP6 we had some opportunities to know her better. Then other shitstorm like Patrick is comming, etc. Throuple formed quite early, but they became official later than all other LIs in the game, so only "others road" is a competitor here. And even so, we hadn't a lot of chances to learn better about girls families, etc. We don't need to learn a lot about Sage, except her birth parents (mother), Bella's parents are dead, Jill parents... well, we should meet them soon, etc. I suppose DPC is holding extra info from us for the sake of the drama and plot twists for Jill and J&M past, families, etc. And we can't blame him, because it's how most of books/movies/games are "working" and such methods is intended to catch the reader/viewer/player.
But if you put scenes from the past and the present/the future, such as dating and hanging out together, on the same scale, I personally prefer the present and the future.
Interlude and Zoey was an exception. It was really valuable to learn about MC past through his best friend vision. We are not only learning something about Zoey, but a lot about MC as well.
If the DPC is going to repeat the narrative style of AL, then we have only 3 episodes left to stay / spend time / etc. with the chosen LI.
Because S4 will probably become similar to a "therapy" session in AL. Difference here is games size, in AL it took DPC 2 episodes to tell us the story "after" and conclude all branching, choices and consequences. BADIK is several times larger, so, it would take the whole last season to let us learn the second half of MCs college life, to bring us all consequences of our choices, etc. Even party planner and other stuff is not an obstacle here. In EP9 we planned the party during MCs flashback, for example. Think about it