Nothing has changed, we still enforce the same nickname policy that has been in place for years. Similar to your username so that people can easily identify you. (Please note I am not pointing out anyone in a negative manner, I am merely providing examples)
These are current -similar to username- nicknames on staff.
-DeeGam02
-LadyClaus
-Mission
-Mad
-Georgia
You know exactly who everyone is at a glance yes? Then its fine.
Past ones have been things like
-Ndm
-MamaSmorezs
-7am
-TwoSixFive
-ThreeOneFour
They don't match the IGN exactly, nor is exact name required. They are easily identifiable and its fine. This suggestion is suggesting 100% no deviation that we must use our exact username 100% of the time. I just don't see why its necessary to enforce something more than we already are. Most of us use our IGN anyway, getting more strict on this would only target a small thing among staff when it is actually a more annoying one among the normal community who do have the absolute freedom to make their nick to something entirely different than their username.
https://ecocitycraft.com/forum/threads/allow-people-to-toggle-nicknames-globally.152109/
I prefer solutions that would benefit everyone as a whole and with choice rather than enforcing unnecessary policies on a portion of the community.