This is my view also.So, after reading this article. I will shoot steel case ammo, save $1500 over ten thousand rounds and expect 10-15 malfunctions per 10k.
I have no time to reload and probably never shoot 10k thru a single AR. New barrels are cheap.
Granted I've never ran 10000 rounds through any of my ARs, but I don't have any problems with steel cased ammo.