What are the consequences of changing a user username?

I’ve migrated an old (15+ years) phpbb forum and the usernames were set automatically by Discourse.
I’m currently allowing users to change their username without a duration limit after the account creation.
Are there any consequences to this (not in terms of user abuses) regarding the forum features? Can a username change break some older links/references, search results or something like that?

I’m wondering about this because of this message that I’m not sure to understand what it implies.

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There are a couple of edge cases (under certain conditions quotes or post revisions can’t be updated), and changing a username is potentially a resource intensive task, but other than that it should work without problems. I wouldn’t worry too much as long as you don’t experience any performance problems by the background jobs updating usernames.


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