I doubt that the FAA cares at all, but the parameters surrounding Basic Med were specified by Congress...the FAA didn't get a say. The AMA..who knows? It's a pretty irrelevant society, membership representing about12% of physicians, and a substantial percentage of those are medical students and residents who don't know any better. I would assume that they aren't big fans of chiropractors acting as physicians, but don't know for sure. As to dentists doing physical exams...that thought makes me laugh, but the fact that those two groups are doing Basic Med exams in some places and it's still not medical mayhem in the skies probably speaks volumes about the value of FAA medical exams when it comes to General Aviation.