It's just a matter of degree again, as usual. I for one hate FF style weapons (swords 1.5 times as long as the character wielding it etc). You need to consider, however, that you always (well most of the time, *cough*) have a choice. As you say, there are historically accurate *and* more fantastical daggers around. If you like the former, then pick one of those, and leave the latter for others who may not share your preference.
Now if DA:I had only offered fantastically crazy weapon designs you might have had a point, OP. But the way your post comes across is 'remove dagger designs that I don't like because <reason>'. And I detest the idea of removing the last shreds of choice this game actually offers, even if I personally tend to gravitate more towards the realistic than towards the fantasy tip of the scale.
So I stand by my firm 'no' to your suggestion. Choice is good. Removing choice is bad.