Compare this low-effort comment:
https://news.ycombinator.com/item?id=14124411
to these:
https://news.ycombinator.com/item?id=14149200
https://news.ycombinator.com/item?id=14016438
Getting "in" when a post has few comments and is going to attract a lot of comment readership quickly or stay on the frontpage for a while is probably more important than pure comment quality.