I agree. Those generic usernames make interacting with users more confusing. Since users by default only have 3 days to update the names, I expect that frequently they will notice after that time has passed, so staff needs to take care of renaming them.
I really enjoyed that Offering blank username suggestions rather than ‘UserN’ at signup prevented that from happening for example here on meta. The last userXXX was created on January 7th before that fix was merged. Then there was no new userXXX until this feature was enabled, and since then there are 12 new ones.
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