And that's why we have 3 difficulties for raiding
If you want to mash your buttons, eat pizza, chat with friends, go take a bio-break in the middle of the fight you have LFR.
If you want to mash your buttons in right order but not perfectly, if you want to stand in wrong shit on the floor but no too long, if you generally want to screw something up but know what you screwed and get it correct you go normal.
If you want everything done perfectly you go raid hc mode (well, ofc, you can fuck up too :P).
If you don't want to raid, rotations are worthless. Just spam what spell name you like.
Ah ye, lol at the arcane mage guy in video