All of the LI's will get more screen time in Ch1. Think about it, standard chapter length is ~2300 renders or so. A longer main story chapter might be 3000. If Ocean delivers 8000, that means 5000 to share between all the LI's on solo paths (I choose these numbers for simple maths). THere are 14? LI's, so that would mean each gets around 350 renders, additional to where they appear in the main story. That's in one chapter.
I wouldn't read too much into the first season, it's like any RPG where they have the training level where you fight a rat invasion before being allowed out to the main map. Despite only 2 characters having specific 'romance' time, we do have an idea of all the characters personalities, and idea of who's who etc.
Nika can't feasibly visit everyone on the first day of college, Sonja's path might be the hardest because she lives under control, with her family dictation how she can socialise - so events like the tabletop will be maybe more important for her, as well as maybe skipping lectures to hang out with Nika. Her path can't make sense unless it has a slow start. Same with Sasha who has a bodyguard who looked ready to intercept NIka. The reasons for Nami and Bella taking so much screen time as you say are obvious - Nika lives with Nami and is forced to work with Bella. We're offered the chance to stay in our comfort zone or one chance to step out. Nika didn't move in any of these social circles before college, so it makes sense that the ice needs to be broken. One night and tennis match with Zara and she's getting naked, jumping on his shoulders - Ocean's condensing the time and everyone's acting purely on hormones and good first impressions.
The challenge for Ocean from here will be how to keep each update as significant - does he intend on having this many branches running through the whole game, increasing the number of renders for each chapter from here to 5-8000? I imagine some chapters will be mor story driven, and have less LI content. Regardless he's certainly not shy of making big decisions, and I'm not afraid my preferred girls won't get content, it's always going to be a worry about whether they change cup size in the dev time