what you are suggesting is a different animation for EVERY weapon. (if they have to do it for the katana, they have to do it for all the other weapons as well, as it would be strange to single out that weapon)
while this could be done, and it would make the game a lot better, it is unrealistic
Yes, that is what I was suggesting and it could have been done if they had have done it from the get go. There's a lot of things that should have been done in production before release that Bethesda failed to do properly. Such as, adding mounted combat from day 1. Anyway, my point is, that if they can do an animation of the character spinning around while hacking and slashing without much trouble, then they could do other stuff to not make it seem so monotonous. Some of the armour types, for example, don't look right when executing certain moves. An example: My character wearing heavy armour shouldn't be able to move as easily while swinging a blade, mace, axe, or warhammer. They walk slower, but that's about it. Different armour types should be taken into consideration with the kind of weapons that are used as well.