Things to think about before you call someone "Bad"

[Penthea]

Yes you keep calling them bad until they've proven otherwise. Most of the time, you reorganizing your binds/hotbars/skills so you can easily find them on the screen, not for your rotation. If you need to practice, then you should do so on the several training dummies each citystate has. All of these seem like a bunch of excuses on why someone should get carried rather than learning whatever they need.

I think that player is referring to someone being told mid-instance to change something about their rotation and they might find it difficult to because their keybinds are not set up optimally for it. The player obviously hasn't the time to fiddle with their ui a lot if they're already in the act of doing content. Never mind that so much about getting dps to be decent is having trained muscle memory. Unless the change is tiny the player won't transcend into new muscle memory very smoothly mid-instance.