Yes, I am intentionally not going to perform as well as it’s possible and I don’t expect it from others. Also using a buff or consumables has not that much to do with playing well. It doesn’t matter if you get drums or worldbuffs and die by standing in fire or pulling threat. For many players it’s just a bluff. They get worldbuffs and consumables just so they look like they are hardcore competent raiders but play like keyboard turners and mouse clickers.
I raided Naxx and was also intentionally not using all the consumables and world buffs that would be available and increase my performance because I did not need them. I also raided MC/BWL in phase3 as a paladin-healer with 0 talents in the holy-tree xD