Yeah, until gameplay mechanics corroborate the "stories".
Technically canon has to do with substance/story, not game mechanics
^Already tackled the point of past-game mechanics.
I'll put it another way, before I go off to watch some Game Of Thrones. If you found no use in Acrobatics, or the ability to run fast, then thats on you. You didnt get everything out of the ES experience.
I found use it those, only because it was a game that NEEDED those kind of things to get around the game world. If they create a world that doesn't need moon jumps (i.e. implement ledge grabbing/climbing) then I think that that is progress.
and you can run fast still... it's called sprinting... there's also a good chance the "stamina" attribute will trickle down into what was previously known as "speed" but i don't think there will be as much variance as before between lowest speed and highest speed.
not to mention perks...