Is your feature request related to a problem? Please describe.
When you're reading comments in a deeply nested reply chain at some point you're done reading about whatever topic the parent commenter prompted. This allows you to easily close that whole chain of replies so you can focus on the next top-level comment.
Describe the feature you would like to be implemented
A button on every comment except the top-level comments which will collapse every comment below the parent comment.
Is your feature request related to a problem? Please describe.
When you're reading comments in a deeply nested reply chain at some point you're done reading about whatever topic the parent commenter prompted. This allows you to easily close that whole chain of replies so you can focus on the next top-level comment.
Describe the feature you would like to be implemented
A button on every comment except the top-level comments which will collapse every comment below the parent comment.
Describe alternatives you've considered
N/A
Additional context / screenshot
I use Refined Hacker News which adds this same functionality to HN: