People are talking about moving markers for a key early mechanic in Unending Coil of Bahamut. The first Ultimate raid that came out two years ago. The one raid that is still considered the absolute hardest content in the game, and that SE is adamant on never allowing players to unsync it.
Go do UCoB and make it to the Nael divebomb phase, if you even can. Because with the inability to place markers mid-combat, the mechanic just changed from 1-2 people on lookout duty checking to see where and in which order the dragons outside of the arena spawn in, to having 7 members of the raid (MT never gets targeted IIRC) needing to pay attention while they are still expected to resolve mechanics going off from the main boss at the same time. And this example isn't even something that has anything to do with third party programs automatically placing markers, since the random directional nature of the mechanic means the lookouts were placing markers manually.