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Why can't I change my username?

This question is pretty self-explanatory.
Answers
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Depending on how they manage their database of user accounts, usernames are probably a unique identifier. The system may depend on each user having a single, unique, unchanging username.
It is also probably to prevent exploits and impersonations. Someone could choose a similar name and the same profile picture and pretend to be another user. Potentially most destructively, a mod.
Finally it can be annoying if users change their names all the time. It makes conversations hard to follow. And again, it might be used for exploits like evading bans.
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Most likely a security measure. I'm guessing the only way to ask for name changes is asking customer support for it.
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We know. What do you think we are talking about?
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