Just like how on Twitter giving an application access to your account can let it post Tweets for you.
Now this is not possible without selfbotting which is disallowed by ToS.
So it would be cool if we could let Authorized Applications safely use or change parts of the profile on our behalf within reason (so stuff like pfp, status, rpc, etc) in a way that we can deny the request or revoke access.
This could let us for example change our profile picture based on what we were doing or what mood we select in a program. Or it could let us change our user status more dynamically.