This, known as fingerprinting, is collectively considered a bad thing. I am thankful this isn't elsewhere
(This is unlike WWW. WWW is so complex and messy that it effectively does have fingerprinting and is difficult to change.)
This is authentication. Fingerprinting is something else.
I mean, it depends, right? If you only surfed the web or connected to chats with a single pubkey, then yes - that's probably sub-optimal.
But pseudonymity, imo, works best when you can consistently prove that you own your identity, and that nobody can impersonate your pseudonymous account. (You can always burn it and get another one, or have multiples, etc, of course.) And pseudonymity is something that is, while contentious, is not collectively considered a bad thing.
Yeah, don't give anyone any ideas, or someone might do something crazy and start tracking everything we do on the web.