People want to prompt a sub discussion based on their response to your original post, and provide the original context of their remark.
Without an algorithm to do it well, seeing replies requires actually going back and revisiting a post to see comments, or seeing a flood of out-of-context comments. (At least on Damus)
Nostur does show comments alongside the OP, but sometimes the comments in the middle get lost… this is the sort of thing the big tech companies honed over the last decade that we don’t have when we start to rebuild