The problem doesn’t seem to be that instances want to cater to a unique political group (that’s why we have federation) It’s that most instances cater to the same or similar groups. I think in general it’s better that instances are differentiated by political beliefs. For example, i don’t like Hexbear. I just block it. But if hexbear and solarpunk were a single instance, i wouldn’t be able to separate the good and the bad.

But i agree that separating yourself too much from other ideas is bad, and echo chambers are bad in general.