NSFW Acc: 
people gonna be in a rude awakening come classic, players gonna just inspect and see whether you're in blues or epics, and people had loot tables memorized so they knew what tier of raiding you were just from glancing your gear. & other indicators like health pools and mana pools
-
This Tweet is unavailable.
-
And I know achievements didn't exist back then but, people will find ways to gatekeep content. Whether it is linking a piece that drops from the instance that they have equipped or what have you. People will find a way to compare and exclude others.
of course they will^^ and if its not though an automatic addon, something like http://raid.io may rise, or just a discord, or whatever. But people will use them tools available in 2019