This is not an issue that personally affects me, but it has caused several people I've tried to get back into the game to be very hesitant.
The documentation for display name changes specifically says "full real life name" is what warrants a name change. However, many of my friends only have part of a name that is no longer theirs.
Is it possible to remove a display name containing someone's deadname? How about a display name that could be used to find a player's deadname, such as a nickname they no longer use?