Man, if you think that is bad go ahead and search Lost Ark Legion Raids. Korean players literally devised their own method of communication (mostly for PuGs) whereby players would huddle before a Boss encounter and review positions and roles.
This was most often associated with a numbering system based on their relative position on a clock. Typically, Legion Raids had numerous wipe mechanics whereby even just 1 player failing would result in an entire party wipe.
To make things more complicated, call-outs where actually typed short-hand and you had to set Chat Filters to even see it. This might look something like a number followed by letters to indicate Orb Color and position and your sequence.
It was all VERY dumb. Valtan was probably one of the better Legion Raids as just knowing the fight and animations was mostly all it took, but man, interjecting that into this game? It would make The Hindenburg look like a minor accident.