Great Weapon Master alone makes dual wielding the worse option.
Guarantee +10 damage is just that strong in practice
+10 is huge for sure, and I don't know if you can justify it any other way. I feel like in this if youre looking at their math and you have 50% hit chance a great axe 6(1d12) its 3 DPR. If you are dual wielding Dragons Grasp 3(1d6) + 2(1d4) and a scimitar 3(1d6) youre doing 4 DPR. and when you add in both weapons getting dipped or on fire it almost doubles the damage output of a 2H. For as many 2H as they put in the game, great weapon master seems a very specific choice for the the scope of classes and feats you can do to make them worthwhile.
