Hmm... well if it's something that wraps on the weapon, it's hardly an off-hand item is it... :P
Call me pedantic...and I will return the compliment.
Definitely agree on your second point. If the 2H weapons were not more powerful than the 1H weapons I would agree that some change would be needed, but since 1H weapons are clearly weaker, it's not a problem.
One thing I'll mention again though is materia. I really wish that they would introduce a kind of materia that has a slight impact on the main stats of a weapon. Nothing game breaking, only a point or two at the very, very most, and since they mentioned tier 5 materia in the live letter, I'd suggest that tier 5 materia would be the only tier capable of affecting a weapon to that extent. Probably won't happen, but it would be nice, and give another avenue to customize weapons.