Individual routes having bearing on main story: significant or not?

I’d like to bring G-Senjou No Maou to the stand.

Looking at the main route and side stories, you really aren’t needed to read them for the main story. Tsubaki’s route literally ditches the main plot at the end, Kanon’s actually has some relevance to the main story but in the end ditches it, and don’t get me started on Mizuha.

But, it all depends on the reader himself. If you didn’t like the Chapter and how it focused on that one character, don’t read her route. If you did, read it. It’s simple.

Regarding Little Busters!, the anime showed us how much the routes mean to Riki and Rin and how it strengthens them to fight back and save their friends. That is one way of having the routes bear significant importance to the plot.

Rewrite not so much since the world ends in practically half of them.

I’m not sure what my point is now.