No, I am the type who thinks a destruction mage needs some serious spell cost reduction to be effective (not necessarily free casting). I do it with enchant. You do it with items found in the game, but you are not relying solely on the cost reduction perks, plus staves and alchemy.
You had a long post above (or was it in a different thread) about how you don't need enchant for spell cost reduction as a destruction mage because you carry around 100 pounds of staves and potions. But you are getting a 35% spell cost reduction from items found in game in addition to your 50% from the perk, so that is an 85% reduction.
I can do the same thing with enchant by making two pieces of 25% reduction gear (ring and necklace) and wearing the archmage robes and wearing your Dragon priest mask. Or, I can enchant a circlet and get 90% cost reduction. Or I could enchant a falmer helm and wear one of those circlets that gives you a five percent reduction to each school for a 95% reduction. Lots of options with enchant other than free casting. Combine alchemy to get your enchants up to 29% and you have even more options.
EDIT: BTW, my Altmer has 200 health and the rest into magicka. I will eventually put another 50 into health but the rest into magicka. So, in that respect he is not that much different than yours. With enchant, you can only get free casting in two schools, so even if I go that way, I will still need a good pool of magicka to cast spells from other schools.
That's 85% off of base costs whose values can't even be reasonably achieved in-game even at level 81, like Firestorm's 1426 base cost. Even then, it's not totally 85%--the cost reduction values from different sources in coding don't stack quantitatively. That's like saying that I have 129% cost reduction because my Destruction is also at 100, since that makes my spells 44% more cost-effective.
After perks and skill increases, there's little use in reducing casting costs to almost zero. It's a cheap way to play the game, not to mention that it sorely lacks in versatility and utility: if my Enchanting skill or Alchemy was nearly high enough to do what you or other players typically do, I could instead increase my survivability with extra health, health regen, or armor rating; combat effectiveness by reducing the costs of
all schools by 25% instead of one or two by 100%, increasing total magicka (which, again, all magic benefits from), magicka regen, or increasing weapon effectiveness for skills I don't use (so as to level them to 100 and be competent in their usage with a mage); non-combat utility by increasing Speech, barter prices, Sneak effectiveness, stamina, stamina regen, or various other things. 100% cost reduction or anything near it is always ever a waste.
And for that matter, I believe I also wrote that I rarely use my staves (four of Fireball, two of Chain Lightning, one of Wall of Flames and one of Expel Daedra) and haven't used my scrolls, and that potions are of little use with my Restoration skill and summons to keep me alive. Nowhere did I mention that my magicka pool or spell costs are a problem for me, so don't paraphrase me as if that was implied.