Maybe don't take disagreement so personally?
I too would like to do this myself and not have AI or anyone else decide for me what content gets lumped together.
I predict that this is also an issue that will slowly resolve itself over time, as critical masses of users gradually coalesce around one community, or more...but only if the extras are distinct in some way...which would very specifically be made more difficult by the sort of programming you're proposing.
I'm not saying there's no merit in your suggestion, only that it may not be the one-size-fits-all solution that you seem to think it is
I feel like the main step he's forgetting is that he wanted to install an interim CEO to make these unpopular changes so they didn't happen directly at his direction, so that the dust up can be laid at someone else's feet...after which he can swoop back in, replace them with himself again, not reverse the changes, and avoid the blame.
Not that she was great, but I do kinda feel bad for the way Ellen Pao got dicked over by Huffman and hated by the community.