I feel ya. The IndieWeb seems enchanting, Micro.blog seems like a nice community, all of the learnings from app.net seem to have been learnt, but when you look under the hood -

IndieWeb is a moving target, I've not yet seen a 'shipped' thing that I can trust.
Micro.blog IS a silo (wholeheartedly agree with you)
app.net is a story that will repeat.

I've just resorted to WordPress comments. Simplest thing. Also, I have my own 'liveblog' which I just use as an RSS feed and entry point to post everywhere else I want to syndicate. That'll live longer than any of these. I don't care for comment support on that thing because it's more about my own thoughts than the conversations around it.

If any conversation becomes something real, it's worth blogging about.