You are exaggerating. Honestly. I played Arcane for the first time since it was a thing in BC kara days. it took me all of 4 pulls to wrap my head around it and after that I was pulling huge numbers on bosses. What new player is going to encounter a SEVEN minute boss fight? Clearly none. Ever. Arcane can pull pretty decent dps even with blast spam. It’s a great beginner class and spec, and to be quite honest, it’s not at all that complex. I dare you to play resto shaman. You’ll probably spend half an hour putting your bindings together before you even begin sucking at it. If you want to compare the two; it’s chalk and cheese.
Arcane is def easy when compared to rogue in terms of skillcapping. Fire Mage far exceeds the skillcap req over Arcane, there’s classes that suffer at the hands of micromanagement, and aff lock is the king of them. Arcane isn’t that high up on the scale, sorry.
There are simply classes, sure. There is also a simpler spec for Mage- Frost. Frost can be a high skillcap depending if PVP or not, but it takes more nuance to kill players as frost than it does arcane… Simple is Ret Pally, DK and Fury Warr, Range simple is Arcane Mage, Destro Lock and BM hunter.
We can leave the facerolling to the Night Fae Boomkins of this World (of Warcraft)