It's mainly just an early story thing. They eventually become too busy to have high school drama. Except sometimes they still have to go back to high school, though the stakes are so different and raised it's not really high school drama anymore.

I do agree there is far too much of that in the first arcs, but I think it goes away once Coil is introduced.

There is extremely little romance if you counted the pages compared to the length of the whole thing. It's 1.69M words.