Most of all of this sounds like bunk to me. I fired up oodles of M16icon's while in uniform , mini14's ( yuk ) and wads of other223/5.56 rifles. The only ammo problem I encountered was the A2 rifling twist (1-7) did not stabilize the M193 bullet and the A1's (1-12) did not like the M855 bullet. And for that matter I don't care for the "product improved" M855 bullet either. I see a 1-9 twist AR and I still think of it as "compromise twist".
The only AR blowup I have seen was an H&K video on how they could submerge their 416 piston upper in water pull it out and immeadiately shoot it. While they did the same thing with a standard A2 and it literally blew the upper into scrap - big pieces lost there !.