When a post has dozens of comments (like this post does), it can be hard to tell which comment is a reply to which.
My proposed solution:
When I hover my mouse over a comment, please change the background color of its parent post and all replies, something similar to what we have already in chat.
I suggest a very pale yellow, since black on pale yellow is a nice, high-contrast combination.
(There was another proposed solution. I prefer it, but it was declined, and I don't know why. That proposed solution was: "Let's make it easier to reply within comments".)