In what you are saying, the investment of magicka would only benefit at the start of the game as a mage.
Even at level 50 as you think most people would play the game at, your investment in enchanting and alchemy would already make you a more combat effective character from item crafting.
Here is a character design made from a knowledgeable member of the forum:
http://skyrimcalculator.com/#24343
As you can see, it can be achieved at level 27 with plenty of perks to support her combat skills.
Beside this, in most RPG, there is a tradition that the combat power of your characters is highly dependent on your items, for Skyrim, what crafting can offer could take you to a whole different level then relying on found items and your perks.
I personally don't look at the start of the game as a mage, level 27 or even 30 is easy and quickly archiveable, I don't think I am the one who is shortsighted here.
You dont play "at" level 50- level 50-55 is usually the sum of a characters skyrim playthrough. It is the end, not the start. To not do any- or even most of the quests before that level would be insanely boring.
It is clear you don't understand my argument, and that is fine. Your posted example is not a
mage, at all. You can make a 2-hander/ enchanter character and switch to a mage halfway through your game. Yes it "works" is it genuine? not for me. It is the same as the old argument in favor of heavy armor over light armor for sneak characters. The old addage was that heavy armor was just as good as light for sneaking because at 70 skill you would get the 0 weight perk for it. That doesn't work for me since you are what you play in this game. If you can't sneak for more than half your game- then you
aren't a sneak build.
See it is fine if you want to just scour some random dungeon to level yourself over and over to activate your enchanting perks and become a mage at 30- but its no different from me taking my old vampire character (level 60- done with game) and enchanting him up some 2-hand buffs and getting a greatsword. Yeah- I have that stuff, but I wasn't a 2-hand character- I did the game another way, and that is what I was... Mercer is dead, skyrim is restored, ect ect. its done. Again- if you are avoiding all quests so you can build this optimized mage, well that is your thing I guess, but I think you are in the minority in the "this is fun" dept.
You are right- shortsighted was backwards, farsighted was better.
Now- if we are just judging this thread on the merit that you say don't level magic since you can get the costs to 0, well then that was common knowledge for a couple months now. If you are actually "playing" a mage, you would probably want some magic in the beginning.
I suppose we play the game differently. I just wouldn't find it fun grindng levels so that I can stomp quests at late level with no effort/tactics/decisions/thinking/ect.