...Just like to see an article or textbook or any thing where a DO, rather than a PT, performing this modality. Why is it so difficult for a supposedly legitimate modality?...
Not going to reply to the rest because its designed to be inflammatory.
With regards to the above: because its an obscure technique used only by specialists in specific fields (e.g. urology). None of us on this forum are specialists in the realm of intravaginal techniques. None of us were actually taught them or tested on them in medical school. Why would any of us have a textbook on it? You've already been provided with documentation and reports of it being used by both physical therapists and physicians alike. You're being purposefully obtuse on this.
Also, you should be well aware that many aspects of our "modern practice" is not actually based in evidence. We certainly strive for them to be, but they aren't. We are constantly modifying our practice because of the discovery that what we do is either not as effective, useless, or even harmful. That's not even to mention that parts of what we do that have significant patient-centered aspects and have to be adjusted and tweaked based on a variety of things from the patient's specific condition, their ability to implement, access, or afford certain treatments, and our own capabilities as practitioners. That's medicine in all of its imperfection.
If DOs pass usmle 1 through 3 or mds pass comlex 1-3 licensing exams then should be md/do license, especially if combining residencies. Otherwise it’s just political BS...
Licensing exams don't get you a degree, they make you eligible for a license. The school from which you graduate defines your degree. It just so happens that in the US we have two types of schools from which you can attain a medical license.
Your state law defines from whom you get your license. Many states have only one medical licensing board that provides both MDs and DOs (and MBBSs and MBChBs and BMBCh, etc.) with a license. In other states, the boards are separated into Medical and Osteopathic Medical boards. This is usually a function of historical context or DO lobbying.
There really is no true use for the COMLEX at this point, because you could easily test OMT knowledge with something like the OMM shelf, but it will persist due primarily to history, the existence of the NBOME, and political inertia with regards to changing state laws for the licensure of DOs and changing COCA policies for the requirements of DO schools.
As an aside:
The political context is interesting, and usually follows a similar story about DOs not being allowed to participate in the past in aspects of medical education, training, and licensure run by MDs despite legal equality (which varied significantly by state), so many had to create their own versions of everything. One interesting thing is that the ASO's (American School of Osteopathy, now ATSU-KCOM) original charter given by the state designated them to confer the MD degree, but Still sent it back requesting conferring of the "Diplomat of Osteopathy" (original DO) degree.
Its also interested that even as early as the 1910-1920s DO leadership had discussed things like merging with MD schools, since the medical establishment has started to incorporate ideas like homeostasis, self-regulating and self-healing properties of the body, the importance of the mind, and developed medicines that were actually beneficial to patients unlike the "heroic" medicines of the late 1800s. Its interesting that Still initially didn't mind the idea, but later vehemently rejected it after talking to more of his students and reverted to his dogmatic view of "drugs = bad". Its also interesting how despite this, the DO establishment actually did advance, did incorporate all aspects of modern medicine, and became functionally equivalent to MD schools within decades. So much so that a school like UC Irvine could change overnight from conferring the DO degree to the MD degree.