Would this really happen, tho? Also you could give a prompt to new users on this issue and tell them how they can subsequently block those accounts. Sure, there are always pros and cons to doing things, but in my experience the current approach where you give a select few people total control always results in total echochambers. Which I believe on the broader scale just reinforces the political divide of a society.

The solution is quite simple, really. Mods (or anyone else for that matter) should not be able to ban people. The concept of global banning shouldn’t exist. If an account posts/comments stuff you like, then just block it on a personal level. Global banning (especially when the decision can only be done by the mods / a select few people) will always lead to echo chambers.