Nest & Collapse Comments

Would really like to see the option of more deeply nested comments, along with the option to collapse all nested comments. (See how comments work on Substack.)
As it stands now, comments on Heartbeat are nested only 1 level deep, which can be quite confusing for more complex discussions.
In addition, the entire comment thread is now visible, which is also problematic in terms of reading ease with longer and more complex discussions.