Earlier quoted context omitted.
I think the most important aspect of a community is its members. Reddit, Facebook, etc have all tried hard to grow their communities and have reduced the quality of them as they increased the headcount. The best communities don’t strive for the hockey stick growth.
Reddit and Facebook are not a single community, they are many communities some of which have a very high bar for quality, and some of which are a free for all that tends toward low quality memes and trolling.
In the old design you could go to /r/subredditname/comments and see an ordered list of comments regardless of which post they were associated with. It really livened things up and let you track the conversations going on given that there wern't that many new posts in a given day. That's gone with the new design unfortunately.