I might be off a little when I say this, but I am going to make an assumption and say- As a one handed player, my melee perks are pretty limited. Blacksmithing is my ONLY way to improve my damage other than potions, right? Last time I checked, destruction perks granted some amazing bonuses, enchanting can boost destruction stats, as well as potions too?
Wrong. Blacksmithing is just the beginning. Real fun starts when you combine Blacksmithing with Enchanting. And if you add Alchemy into this...
Well, to put it short, one guy managed to get 3000 armor and 1500 weapon damage for around 60 seconds,
or around 500 damage and 1500 armor on constant.
This is how you do it.
Lvlup Enchanting and Blacksmithing to 100.
Make full set of "+% to Enchantment" enchants.
Then use it and repeat the process.
Then, using the second set, make the blacksmithing set.
Then upgrade your weapons/armor. The more smithing bonus you have, the MORE will be bonus when you upgrade weapon to Legendary (not when you create a weapon, but only when you upgrade it)
Now you use second set and make a full +% 1h/2h/bow damage and + to light/heavy armor skill (depends on what you're using.) I've seen +75% to weapon damage enchants just on ONE item (and they stack with other items....)
And if you add 100 Alchemy into all of this

At same time, destruction magic always stays at it's 90 (or 180 when dual casted; both numbers are taking perks into account) expert level spells. There's no way
to increase it. and Master spells... they just don't worth it.
So at level 50+ Destro mage becomes completely unplayable.
P.S. I'm not saying Smithing+Enchanting combo should be nerfed. There's no reason to do it.
But destro mages should be playable through all the game.