I think the term that puts that into perspective is D-pad, not WASD;
WASD keys are generally bad for multiple keypresses at a time in different directions since the orientation is kinda weird if you think about it; D-pads you're just mostly using your thumb
That's why you don't use the KB for fighting games; where FPS's are more there's more button holding than tapping.
Why would you use diagonal movement in a menu?
And again, if this UI has problems, they're general problems, not PC only problems.
The consoles show more information somehow? The consoles show your equipped items all the time? The consoles give you a quick summary from all of your items?
And I still stand behind how Morrowind had much worse UI, even if it is "PC friendly". If you're saying drag-n-dropping and double clicking everything and hovering over several nondescript, exactly the same icons to get an idea what the item actually is, is much better, then you're just full of it.