To be fair this has been a thing since launch. Even in the second week of the official ARR launch people were being asked or told to skip the CS. The main reason is because SE put sooooo many cs into these dungeons and long ones at that. So it can sometimes tag on an extra 20 minutes to a dungeon which is absolutely absurd to begin with.

The first few times you go through the dungeon its fine but when you are running it the 50th 100th or 1000th time you are like....nooooooooooooooooooooooooooo lol

Its the same with the cs before primal fights for instance. Sometimes, if people are reading slow it can easily take longer than the fight itself. Like the leviathan cs, omg se what were you thinking.