Quote Originally Posted by Silverquick View Post
That's DRG, but take Summoner for example, if you had to blow a GCD on something it may not be ready anymore for your standard rotation so you'll have to skip it or do something in a different order than intended.
Do you understand how Summoner works? Casters don't even have combos and yes, losing a cast is bad, but you also hilariously picked one of the best mobile casters as your example, the Summoner who has instant casts for almost every situation?

In either case, you note down when the mechanic that interrupted you happened. You plan for it so the next time around you sacrifice as little as possible (read: in most cases, nothing) to simultaneously complete the mechanic and not lose a cast. That's how casters tend to optimize, all three of them (six, counting healers).

If you are actually asking about Bosses randomizing their attacks, hell just Brawler in Alex is a good example. The one where he holds up his arms depending on the attack he's going to do. Its never the same one twice but its always random. There's a TON of them. Why are you even asking that?
The timestamp of him performing the mechanic, however, is the same. You know that Mechanic X, Y, or Z is coming, and you have your plans for how to deal with them in your head. The party is generally going to be in a place where they can easily get in position for double beam and bait for double drill. Melees all have gap closers for the eventuality of single drill. Mechanic is called, people react, and in interacting with the mechanic they maintain their rotation to the best of their ability.

Their ability to maintain said rotation generally results in a much better damage per second amount, as well. Yes, flexibility is good, that's not in question: your line in the sand that fights aren't scripted to a hilariously exact degree, however, is not a strong position to hold considering how this game is played.