I would again argue that if you look at the 2019 Conference results there was plenty of parity and balance. Additionally, there are multiple Conference tournaments a year which no Major teams attend. These teams are choosing to play the tournaments that the Major teams are at. You don't get to call out Mike Tyson and then ask him to tie one hand behind his back.
The not going to a World comment is directed at the fact that Conference is open rosters. Teams are classified by USSSA, not Conference, based upon respective rosters. So the only reason to intentionally limit a roster during Conference play is to impact what tournaments can be played outside of Conference.
I do not believe that AA and A teams build rosters because they want an even playing field. I believe that AA and A teams build rosters because they want to guarantee a World Title at the end of the year. As DW and I have discussed, essentially building a team for one tournament rather than the best team for the entire year.
I don't see restricting Major teams as healthier for the game. I look at performance against one class up and one class down. I think that you should win 60-70% against the class below and 30ish% against the class above. If you look at these numbers across Conference I think you would find them to be well represented. I think there should be a percentage for two classes up and down as well. Not saying a team can't beat a team two classes up but it should be rare. This does not mean anything is broken it means that you are playing a team that is better than you and they should win most of the time.