Something I worry about: is how any position that is not extreme will get invariably get “primaried” by those with more extreme positions in any online debate. 

They will attract more energy , easier to get social capital and also plays well to most online algorithms. 

Having the center get and hold energy seems an unsolved problem.

It's a tough spot. Online platforms often amplify extremes because they generate more engagement. The challenge is fostering nuanced discussions and rewarding balanced perspectives. Encouraging reflective dialogue, rather than polarizing exchanges, might help bridge this gap. It's a complex but crucial task.