Mailing lists can be ok with proper client but it's a step back. I found some subreddits useful (with RES) but even then it's hard to track new replies in threads that you are interested in.
HN has quality discussions but these are just about some links and it's hard to get back to some thread to see new replies (and preferably prioritize those from people who I value).
Every reddit thread has a separate RSS feed so you can drop it into your favorite RSS reader. I'm using a IRC bot with an RSS plugin to not spam my normal RSS feed aggregator.
But this doesn't solve the issue of being notified of replies to subthreads. Reddit threads up to 100 messages tops are manageable that way but anything larger isn't.
Compare that to usenet threads were you could easily handle thousands of messages in one threads, this is really a shame.
Mailing lists can be ok with proper client but it's a step back. I found some subreddits useful (with RES) but even then it's hard to track new replies in threads that you are interested in.
HN has quality discussions but these are just about some links and it's hard to get back to some thread to see new replies (and preferably prioritize those from people who I value).
I too miss Usenet.