The difference between 1h level 15 and 100 with a simple axe would be 10 damage at most, which is nothing, the most you could get a one hand weapon without crafting is around 40. This is such a terrible argument against destro, the base damage of the spells is already high, 60 (90) damage per spell is a lot, considering how fast you can fire them from range.
Destruction outclasses archery in a non-sneak situation every time, you can cast a good 3-4 spells in the time you shoot an arrow, so 360 damage in the time you fire your bow? Archery is weak in comparison, except with sneak bonuses, but even then it struggles due to the attack speed.
If the damage is too weak for use, then how do my character use it fine on master without alchemy, never used a destruction potion in the entire game (level 60+), once I get around 80-90% reduction (which you can get from found gear+perks, you don't need enchanting) I can pump out 90 damage expert spells at v.fast speeds, decimating pretty much everything I come across on master.
Ancient dragons? They're weak against either fire or ice, so you get a damage bonus there.
Master Vampires? Weak to fire.
Draugr deathlords? Weak to fire.
Most ice enemies? Weak to fire.
Most tough enemies have a weakness, which is essentially a damage boost, so I'm pumping out 90+ damage expert spells now. Answer me how I use it on master, without crafting, without alchemy, dealing plenty of damage (far more than archery) with little problems? Anyone?
If damage got to the point where I can kill stuff in 2 casts, I would simply take away my 0 casting cost enchantments. I'd like my magicka to mean something, and if it means I can kill a Death Lord in two casts but one cast takes away 75% of my magicka pool, I would be perfectly fine with that. Or I could just use a lower damage/cost spell. That's how magic should have been.
Weapons can 1-2 shot stuff too, so why shouldn't Destruction be able to as well? Most people who play melee builds don't let their character become god-like because it would become boring then. You should be allowed to either be balanced or overpowered with Destruction in just the same way.
I see what your asking for now, you want destruction to be exploitable to the extent of 1 or 2 hitting everything you come across on master, like to can do with melee when exploiting crafting.
If you play on adept, you would be able to 2 hit a deathlord with dual cast incinerate, on master it's about 4. The damage is more than enough, the problem is the cost. Read my above post, I play fine on master using destruction on a variety of characters and i've never used 100% reduction or alchemy to boost it.