It's funny that mages need to rely on a non-mage skill to actually boost their mage skills.
The argument against destruction is how strong you can make melee and archery with smithing, alchemy and enchanting?! Without those you would struggle to make archery, 1h and 2h as strong as destruction. Your point is moot.
Destruction mages only need alchemy and enchanting to do high damage. You may hate destruction because you can't exploit the damage as much as the other combat styles, so that means you can't one hit everything on master, what a shame.
Range? Archery gets that.
Versatility? Mages rely on Expert Destro spells for damage, of which they have a grand choice of three spells. Runes? Crap damage and you can only lay one. Cloaks? Mana drain.
100% fortification trivializes the management of a mage's resource, which cheapens the entire idea of playing a mage.
Like melee have the option of three different weapons, hammer, sword and axe. Archery only has a bow. I don't use 100% magicka reduction and play fine as a mage using destro on master, I have around 90% reduction which isn't to overpowering.
The only reason melee and archery get so strong is the abuse of crafting, by your argument does that mean melee and archery is cheap?