You are overestimating the impact of armor when it comes to flat damage bonuses. Flat damage is one of the best sources of damage a weapon-based build can stack, and this is also true for physical damage.
While it is true that physical damage is affected by armor, it also has some of the highest flat damage bonuses available and, as was mentioned, monsters have very low % Physical resistances.
It doesn’t mean anything besides that the person helps us test future patches. We enlisted players of varying skill levels and interests and their knowledge of the game likewise greatly varies. (regardless, in the above case, what he said is absolutely true)