@ OP - You can play dual wield Arms, it’s not very good. Mortal Strike doesn’t hit very hard with a 1hander, you can only get 3 points of Flurry, you lack 10% AP + 10% threat reduction, you lack 3% hit, 2% expertise, and you lack the 9s Whirlwind cooldown (which creates the neat rotation Fury has).
It does play a little like Fury and you can get away with it as a utility role, it’s also easier to play than the Arms Hybrid 2h Slam build and especially so on movement fights (like Archimonde)… But it’s just not a strong dps spec, well played 2h Arms does more damage in every scenario and Fury is in a different universe.
This is completely wrong. Arms is not really worth playing in PVE before T6, it’s one of the weaker single target specs and the 4% physical debuff just isn’t worth it at that phase.
People keep spouting these myths about TBC to the point where a new false reality is created by hearsay and vivid imaginations. In TBC Fury Warriors were extremely common in raiding, pretty much every guild had a melee team including an Enhance, 1-2 Rogues, 1-2 Fury Warriors, maybe you saw the occasional Arms Warrior (usually a PVP) dude, but it wasn’t until Sunwell released that it became a big thing.