Including HN?
I don't “post” on Hacker News. I do comment, but I don't think anyone who are interested in following whatever it is that I may have to say would come here to look up my posts.
Or, to put it in another way, if this place would introduce some social media features, such as the ability to follow people and post to followers, then it is highly unlikely that I would be interested in using those features.
Of course, I'm not hosting my own server, so I am in some way in the hands of its administrator, just like I was in the hands of Google when I used G+. However, I can talk to him directly, which is a huge benefit. Also, if he decides to shut down the server, I can still join a different instance and reconnect with all the people I was following on the old server.
As you allude to, discovery is harder since you don't have an algorithm pointing you in the direction of content you're likely to engage with (yes, engage with, and not necessarily enjoy) but once you have found the right people to follow, it's more rewarding because it's your community, not owned by a single corporate entity.
Although I didn't use G+ much in the later days, its closure showed my how irresponsible it is to rely on proprietary platforms. I'm committed to never be active on a proprietary, closed social media platform again.
My main account is here: https://functional.cafe/@loke