Originally Posted by Gallo
I think this is a simple misreading of the patchnotes (this is common with Blizzard).
This is a good thing, not bad, for button mashers.
Basically it's the same as a /stopcasting macro for latency but with no stopcasting. It will send the signal to cast to the server no matter what your client says is going on.
Yes your GCD will trigger when you press the button to early. But it will get to the server and if the server says you you can't cast yet it will come back to you and cancel the early GCD. So the unused GCD will be twice your latency.
But if you hit the button while the unused GCD is active it will send another message to the server until the server says there is no cast and no GCD so button mash away my friends. Button mash away.
What this may do is melt there servers as their I/Os go through the roof.