Well...you are looking for an end game raid group. So when you move beyond the level of casual play, you really should learn your opener pretty well. It takes practice to be good at any job in this game. And the opener is the easy part. Chopping up your rotation to maximize dps as bosses jump and become invulnerable, adds pop, and you do mechanics is where more of the learning and skill kick in. Your opener should just be muscle memory...which it won't be...if you don't practice it and use it pretty frequently. That being said, even if you don't dummy practice it, you will have plenty of time to work on it as you group wipes over and over in A3.

Don't confuse being obsessive compulsive and wanting to the the best teammate you can be, within reason. They are not the same thing. If I was a raid leader, and your post was an application...I wouldn't take you. But it has nothing to do with the job you are playing. So much has to happen to have a strong raid team to come together and succeed, not wanting to put in some effort to perfect your opener isn't a great sign of things to come. Caring about your performance and putting in effort to be good are a core part of becoming successful. If you deem that as a chore, instead of fun, perhaps end game raiding isn’t for you.