It's not a matter of determining what is, it is a statement of how we want it to be. I can see the reasoning that it should not cost extra to use a weapon that is already in your hand. This kind of strategy doesn't interest me but probably should probably not be penalized for those who wish to employ it. Maybe there is some problem that I'm not seeing? The biggest argument I can see against this change (removing the need to swap weapons to use the off-hand) is that they are so close to release and are almost certainly time crunched as it is right now.
I honestly think it's just simply overlooked. Like I said, I hardly see people bring this up so it's really not a pressing issue for the devs to get it fixed. I'd love for it to get addressed as some point though.
