So much reliance on observers (as with other FPS), but along with that keeping track of utility usage/stock of the players on the map and having to remember all the specific ability names since apparently that is forced by Riot. Not to mention the fact that I have yet to see another esport with as many tech pauses as there are with this game, which leads to being forced to small talk with your co-caster for a undefined amount of time depending on the situation.