Tree-Structured Comment Sections
Currently the comment system seems to be limited to one level of indentation. Although one level of indentation is very good, full nesting would be better. I guess it might be argued that full nesting wont be needed here, but I wouldn't bet on that. Full threading has its own implementation challenges though. Eventually comments will hit the right side of the page and become unreasonably compressed. I can think of two solutions:
The more straightforward solution: render comments at the deepest displayable depth with their subthreads hidden, then serve comment permalinks as separate pages, where the subject comment is rendered as a root thread. To read replies to comments at the depth limit, the user goes to their parent's page.
Something I havn't seen done: Comments just keep going right, but they don't compress. Comment views will have to be horizontally scrollable.
If you were going to increase the depth limit, you'd probably want to rethink the gratuitous consumption of whitespace that's going on in the current style. I'm more partial to the way reddit's material design themes tend to do things https://i.imgur.com/6dHto8n.png . Root threads may be in separate cards, but nested comments are rendered as parts of the whole with implied boundaries.