I think this is one of the challenges with it. At an individual patient level, I agree. It includes an exposure element and I'd unquestionably prefer someone get EMDR for their PTSD than rebirthing + equine therapy + emotional support porcupine + truckload of benzodiazepines, or whatever other nonsense goes on out there. Don't get me wrong, I'd greatly prefer PE/CPT to all of those but I'm trying to be realistic
To me, the biggest negative of EMDR is its potential impact on views of us as a field, perceptions of the profession and psychotherapy in general by members of the scientific/biomedical community and educated members of the lay public, etc. Forget what happens to an individual patient getting EMDR. I worry about the folks who don't pursue therapy because they think we're a bunch of fringe loonies who couldn't pass a high school biology class because of the prevalence of stuff like this, what implicit bias it might create for insurance companies deciding reimbursement rates, etc.