Thank you! World building is one of my favourite parts of writing, honestly!
I honestly prefer giving everyone their own self-contained story. My current side project (which will probably be the next one I release) is the other style you mention where all the routes overlap each other and follow a single plot. I wanted to try that style out just as an experiment, since I've never done it. And I have to say that I don't enjoy writing that way.
It's so much more fun for me to put all the LIs in their own path so I can give them a different story.
That will definitely stay my strategy going forward because it's way more fun for me! ╰(*°▽°*)╯