Do you really think it's their artistic vision or something that weapons must float? Do you think they wouldn't do it if they could because it just wouldn't occur to them without someone telling?
If they really can't make weapons that don't float on your back without gimping gameplay/story/level design, then we have a problem.
Look, we know it's a question of priorities. That's the reason why people are asking to reconsider those priorities.
A sheath for swords and daggers is much more important to a lot of people than, for example, the complex visual effect of rocks sticking to the body of a mage who casts rock armor...
I mean, fewer puddles, bushes and piles of rubble would be a very reasonable tradeoff for, at least, sensible weapon placement (at the waist).
[...] Generally speaking the argument is that in real life, you'd need a sword sheath in order to safely carry your sword hands free. That's true. But in the same line of thinking, we're playing around in a fictional world with magic and dragons, neither of which exist in real life. So it's really not that terribly hard to suspend belief when it comes via sheaths vrs no sheaths.
In the same line of thinking that people don't tend to have hair that is plastic and unmoving. Mind you not all hair moves in the same ways that other hair might. While it's nice to have "tress fx" because it looks more realistic, it's also costly and a resource hog that I would rather be spent anywhere else - up to and including gameplay itself. [...]
The "magic fantasy world" argument doesn't explain why you can have humans prancing around with gigantic steel paddles without them being "magical fantasy super-humans". Dragon Age tries hard to be darker and edgier in order to be taken seriously. A large part of that atmosphere is the result of having humanoid characters we can relate to, who can fuel our willing suspension of disbelief. However, those believable characters are also a potention weak point in the immersiveness of that fantasy world, as we expect them to function much as real-world humans do. And a real-world human can't possibly draw a 100-pound 6-handed oar sword from his back without having a very very weird skeleton.
The back-hovering anime-style weapons and armor designs (dem pauldrons) are working against the strengths of this franchise.
As for needing a sheath to safely carry a bladed weapon, it mostly depends on the weapon. The only thing that war swords and dress swords have in common is the fact that they weren't very sharp, just pointy. Battle-ready longswords were ofen used as warhammers, grabbed at mid-blade to bash in plate helmets. Their scabbard was to protect the blade from damage and corrosion, not so much the wearer.