I have struggled with many of the same issues you talk about here. My Tumblr hiatus, which I took to avoid DA:I spoilers, has been instructive in many ways. I miss the people, but I'm finding that I don't really miss the platform. I'm doing a lot of hard thinking about how to plan my re-entry -- if I go back at all.

Don't follow people with opinions you want to argue with" would mean cutting out a lot of people I mostly really like. And an echo chamber of people who all entirely agree with me is not entirely appealing. I really like being able to have productive discussions with people with different povs, and I know I used to be better at it.

Yes, this exactly. Just because I disagree with someone on one topic, and am tired of seeing them rehash one particular topic over and over, doesn't mean that I want to cut them out entirely. Blocking things on a tag level can help with that, but tag block almost always ends up being both too broad and too narrow (especially considering how bad folks are at tagging).