Although it’s not possible to please everyone, the problems you mention have a cure.
3. Selected, self managed.
It’s like the music industry. Some people like to only listen from their own collection. Others, like a curated theme such as radio station or streaming services. While others like a mix of curated, self-selected and self managed.
With a community the size of Medium, it would be easy to find people who would happily curate. If you could find a way to incentivize them for their efforts, all the better. However, I’m sure many would do it for their own satisfaction. I can’t get no satisfaction —Damn it Mick, get out of my head!