That's the thing:
Prioritize, don't rotate is a good idea that Sunni pushed but it's not elaborated enough. It will never beat a rotation due to the fact that you're solidifying your skills to go off at the precise time and there isn't much that can throw a loop into your skills. Prioritizing your skills however, has this nasty ability of just really leaving you with downtime or bad rune management which in the end lowers your DPS more than you would realize.
I'm not saying it's a totally bad thing: If you know something's going to die fast, a rotation may not be the best thing: Case in point, in Heigan, while the dance, I'm constantly throwing ITs and HBs as well as some DCs when I can. This is a case of priority: May as well do damage while you're running around.
I just don't like Sunni's view of just prioritizing over rotations. It pushes the idea that button mashing is acceptable and it's not.