I think Destruction magic negleted in skyrim because of people of skyrim doesn't trust magic. And not many magic users in skyrim. So I bet, Beth is just trying to follow the story line.
Let's hope Beth fix this in coming DLC or next series of TES.
And does everyone ever considered that Conjuration being negleted to? Not just Destruction, Conjuration to.
That would only make sense if everyone was a Nord.
Aside from that, this whole 'not trusting magic' thing that got invented for the Redguards and Nord the past two games doesnt make any sense.
Tamriel is a wholly magical place. Magic is the foundation of everything there is.
Its like saying you dont trust science. (while of course still driving a car, having electric light and the electric internet and enjoying modern medicine.)
But lets say Nords in general are indeed poor magic users, which makes no sense, but for the sake of argument.
Then we still have 9 other races and one institute devoted to magic in Skyrim.
People in the College practice spellmaking, NPC's have access to teleportation spells (sort of), why doesnt the player?
Magic in Skyrim has been a dissapointment since day one.
Sure, it looks pretty, but compared to all the options, effects, variety and versatility we had before it has gone from a flagship feature to absolute generics.
Its my number one dislike when it comes to Skyrim, and something I find utterly unfathomable given the track record magic had before Oblivion.