Rend stance dancing was only viable on very few fights, basically single target patchwerk fights like Saurfang. Not to mention if you had any sort of latency issues, you were fucked. And the damage increase was minuscule compared to the risk of screwing up.
The rotation wasn't complex at all. Spam HS because we were rage capped 24/7, hit BT and WW on cooldown and occasionally use slam in between gcds. It was not complex, it didn't promote skillcap.