Hand to Hand Weapons.

Hand to Hand Weapons i think should count as a 2 Handed weapon since in theory you have a weapon tin one weapon slot and both your hands are full. So how is that not a two handed weapon?
And 2nd. i want to know why cant you use a grip on a h2h weapon. Since ever weapon you hold it by some type of grip. and why cant you change your h2h weapon grip like all the others weapons.

Because you hit with each hand individually and stats are applied to every hit, even the amount of TP gained/dealt depends on a single it. And while I don't disagree about the grip thing, one could argue that H2H weapons are too small to apply a specific grip to it.

H2H are considered "dual wielding", you add a hit with your left hand when you ws, just look your TP return.
But it could be interesting to equip different kind in each hand to have several bonus (or twice the same, str +18 atk +40 for example).