This is why I am balanced. Some creatures, races, etc are more resistant to certain spells or spells in general. I remember my first troll fight -- melee wasn't the smart idea. And even though I am balanced in destruction, block, and one handed, destruction overcame it. But I think after level 20, you can just punch everything. Box a bear haha
Enchant a bow with fire damage
???
Profit!!
Seriously though, my fire enchanted bow does more damage then my fireballs, even though I've sunk about 6 perk points into Destruction and nothing in Archery.
I have two serious issues with how magic works in this game(disregarding the buggy implementation of the favourites interface).
1) It doesn't scale, your weapon damage goes through the roof as you get better weapons/armor and enchants. However mages only get more mana, it's not terribly useful to be able to throw 50 fireballs without going oom, when you could just shoot your practically infinite arrows instead that deal more damage.
2) Beyond the apprentice spells, Magic doesn't do single target damage anymore. Normally this wouldn't be much of an issue since you often want to kill lots of enemies. However the companion AI is [censored], and unlike the enemies the Health of the Companion doesn't seem to scale. This means that if you try to use magic, you'll randomly one-shot your companion every 20 minutes.
It's so silly. I have 400 mana, 150 hp/ 150 stamina. Yet when things get though, it's always my 2-hander and Bow that have to pull me through, the weapons I haven't even leveled. I'm really starting to regret not just going full warrior in the first place.