I guess you could make a couple of arguments to why its the case
You need to get 2 drops instead of 1 (you can consider the time it takes or even bonus coin usage etc)
You need to get an extra enchant
In my opinion there shouldn't be a difference between the overall stats when comparing MH+OH Vs 2H, it should be a personal choice of looks
Funny enough I was going for MH+OH anyway, so no disadvantage to me perosnally, but I can see why this would annoy a lot of people, regardless of the numbers more stats is always better