I don't need to know who you actually are, but over time interacting with other people here I've started to get a feel for several hundred accounts. This makes HN more pleasant because I have some sense of what sort of person they are to talk with, and what is likely to go well or poorly. When there have been subreddits I was really into, I would start to get a sense for the more prolific commenters there too.
If I regularly attended some sort of social club and it was common for people to replace their faces I would find it frustrating as well.