Allow users to choose the Teammate Name Display option
From version 4.0 the Teammate Name Display option is an administrator only option for the reasons explained at https://forum.mattermost.org/t/switching-teammate-name-display-to-a-system-console-setting/3366
Please add another option in the _System Console_ under _Users and Teams_ "Allow users to choose Teammate Name Display" which allows users to choose how to display users' names in posts and the Direct Messages list.
We understand that the name in the push notification would not reflect an individual user's preferences; this would be totally fine for us (but it probably should be mentioned in the description text of the new option).
The main thing is that our users prefer to choose the way of displaying names themselves.
Here is a ticket to add the user setting, open to community contributions: https://github.com/mattermost/mattermost-server/issues/7560
The users where I work would much prefer to be able to configure this. I am reluctant to upgrade if it means enforcing one choice on everyone.