Literally most classes are.
You need to accept every decent dps has better AOE than fury. Most classes are super easy to play to a high level with very little effort.
Therefore, the vast majority of players are doing more dps than fury warrior, even if the fury warrior is good.
They would have to be amazing to do better. Amazing players aren’t playing fury because they can do basic math and see fury is bad.
Also, if you were an amazing player you could swap classes and instantly do 30% more damage.
There is no reason to even bring a fury. They offer nothing over other classes. At least arms brings proper debuffs.