Currently, community users seem to be assigned a profile slug (@firstname-lastname-code) where the code is 6 random letters/numbers.
We'd prefer if the users would not have to have these 6 random letters/numbers appended to their slug (@handle) to start with. If there are other users with the same name, then just adding a number would suffice. I think it's common practice not to include hyphens in automatically generated slugs (@handles).
Even better, they would be able to edit it to something unique for themselves that is easy for them and others to remember.
Also, ideally there would not be any conflict in handles across multiple community sites.