I clean my guns, so even if what you say is true, it's a non issue. I haven't noticed any extra wear or extractor issues from almost exclusively firing steel cased ammo out of my ARs and AKs. Never had an extractor issue with my pistols other with one brand (I forget the name) that keep getting stuck in the chamber.It's not the steel cases that wear the bore, it's the bimetal bullets. Steel cases carbon up your chamber and can mildly accelerate wear on the extractor hook.
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I can buy more, save more money, and shoot more steel cased ammo. If anything does wear out after thousands of rounds, the cost of the replacement part will be much less than the money I saved. With that said, I never had a problem and think most of the stuff you hear on the inet is hyped up.