Lets see some first hand info from these pros. Show me that and I'll be humbled.
More pointedly, I'd like to see it from a pro who isn't getting free guns and money from said companies.
I saw a torture test on a Daniel Defense AR and I wasn't terribly impressed. Not that it performed poorly, but it didn't excel either. When poured full of sand and dirt it malfunctioned; when they froze it to -40°, it malfunctioned; when they blew it up, it bent the buffer tube, causing a malfunction, etc.