Transmogrification Extremely Misleading

[Drkwispurr]

Same can be said about a one hand axe, sword or mace.

I don't know if you're missing the point, to transmog weapons, saying one-hand or two-hand is completely irrelevant. That is NOT where you should look at. The "one-handed" is just to say it can be equipped in any hand. "Main-hand" shows it can only be on right hand, same as "off-hand" on left hand.
It has to do with animation in this case, don't you get it?
Make a rogue on blackrock with 2 swords, hit dummy, and observe its animation. Then switch to two daggers and chack its animation again, and then maybe you will figure it out why you can't transmog daggers into swords.

[Jakkre]

I don't know if you're missing the point, to transmog weapons, saying one-hand or two-hand is completely irrelevant. That's is NOT where you should look at. The "one-handed" is just to say it can be equipped in any hand. "Main-hand" shows it can only be on right hand, same as "off-hand" on left hand.
It has to do with animation in this case, don't you get it?
Make a rogue on blackrock with 2 swords, hit dummy, and observe its animation. Then switch to two daggers and chack its animation again, and then maybe you will figure it out why you can't transmog daggers into swords.

U can't tmog a dagger to a sword because blizz decided that its not possible. Its simple as that.
It has nothing to do with the one-hand and two-hand weapon classifications.
The fact that a dagger has a different swing animation than a sword, axe and mace doesn't mean that its not a one hand weapon.