This is the same as saying that the admin does not consider such applications at all.
It turns out that "The Pharmacist" has a privelege for it? The admin chose him specifically and chose his application specifically.
And what about the rest of the people? Are they shit for the admin or something?
Send 50 btc and buy the VIP membership, you can change your username by yourself.
Otherwise, contact theymos, and describe your reason why you want to change username. If reason is convincing, like for privacy, dox risk, theymos can approve it for you. With approval, in most cases, only display name changed, username remains the same. In very scarce cases, both username and display name will be changed.
Each user has a display name, which is the only name ordinary users see, and a username, which is what you use to log-in with. Almost always, they are the same.
If I change a name for reasons of appearance, then I only change the display name. The username remains reserved, the user can still login using the username, PMs can still be sent to that username, "search member" allows searching for the old username, etc.
If I change a name for reasons of privacy, then I change both the username and the display name. In this case, it is possibly hazardous to reserve the old username, since it allows someone to test for the existence of that username, possibly defeating the privacy benefit. If you're worried about being impersonated, then simply don't seek to have your username changed.