I wager that the real reason emotion icons are disabled is so that TremStats names do not look retarded.
The argument "so players can easily be actioned against" is void because I could easily recreate the same issue through other means such as making my name "lAk" and then trolling the server, players would have to use my slot number because my entire name is a part of the name "Lakitu7" meaning there would be multiple matches, and people would not notice the similarities between "lAk" and "Lakitu7" because of the colour and casing.
If players require at least three characters together in their name excluding an emotion icon, they can still be actioned against through either partial name or slot number.