Nested comments allow for better conversation
A feature long promised has now emerged from testing: Nested comments.

This means, simply, that you can now reply to specific comments, allowing for a branching conversation to exist. Without this, conversations are shattered and the resulting comment section is hard to follow and ultimately useless.
Once I’ve worked out a practical way to do it, you’ll soon also get notifications when people reply to your comments.
Another feature to now exist is the ability to edit your own comments. Though this is less because it’s finally ready, and more because I only just realised I didn’t enable it.