Skyrim is so delightfully campy and half-assed in so many ways that this could conceivably be considered an intentional FEATURE of the game, though. Bethesda games are ALWAYS huge AND shallow.
Plus after the cliff-climbing, dragon-tanking horse, NOTHING looks ridiculous any more.
Maybe that's what they need to do, since they've added mounts to Inquisition. Make them able to levitate, scale vertical walls, fly upside down, and go mano-e-mano with dragons and NOTHING ELSE will look absurd in comparison.
Personally, I think people who call Elder Scrolls games "Shallow" just don't perceive a lot of the nuance in the world or the game. Even when you consider something like their minimalistic combat, if you are actually playing with some degree of skill, there is a lot of nuance in the timing of attacks, reading your enemies' patterns and knowing the properties of various weapons. (Wind up time, recovery time) TES balance overall is just terrible, making "Playing with any degree of skill" something of a labor of love. ES games are typically only a handful balance adjustments from a categorically excellent experience. (Which the modders usually push out in under six months)
And anyone who cites the bugs of Skyrim as indicative of the experience probably got all their information from the game just by watching PewDiePie or similar youtube channels selectively edited for the "Lolz so #random" funnies. I've put my fair share (500+HRS since 11/11/11) of time into that game, and the game isn't all that buggy unless you're intentionally trying to break it. (Or playing on PS3)
And, to bring things back to the subject at hand, Skyrim has its share of "Floater" weapons as well. The entire Nordic Knotbraid weapons as well as all the Stalhrim weapons and every Two-hander (Obviously). Maces and Axes have little more than a small belt loop (Which is cool, but still hardly that noticeable). They tried to be really cool with Daggers and offset where the scabbard lies, but the result is hilarious and persistent clipping, especially while sneaking; which if you have a dagger I suspect you'll be doing lots of.
Even Dark Souls 2 got rid of Scabbards/Sheathes. Considering the assets were mostly already made and transferable from DS1 I am left thinking that my original hypothesis (Memory limits/cut for optimization) is true in most cases. A frivilous, strictly aesthetic asset isn't worth rendering if it eats into something else.
So the choice is between weapon hanging visual add ons, and unique weapon designs?
Scrap the sheaths, they're overrated anyway.
I prefer my weapons to look believable and practical. Corkscrew helix blades and giant masses of Iron might look "Sooper azomes" but I'll always prefer things more in line with real-world weapons.
That said, I think a lot of people would be shocked at how weird a real blade or weapon can look. The Khopesh comes to mind.