We also desperately need to allow more comments back and forth between users, rather than disincentivize having a conversation for more than a few comments in a row.
I almost end up missing the youtube comment section some times... that's not good lol
The six levels is a limitation and I don't get a notification if someone replies to someone else in that thread. It could be better
That's on the way :) https://github.com/steemit/steem/issues/733