programs should truly be multi-disclipinary. not housed in fiefdoms. Pain is more than MSK/spine etc
as a Physiatrist, there was a lot more for me to learn from anesthesiology attendings (non PMR attendings in general)
where I did my pain fellowship, the pmr dept ran a "spine fellowship" and also a msk and separate sports fellowship. the spine fellowship trained the docs to do mostly bread and butter spine procedures. they didn't manage opioids, acute pain, implants, cancer pain, palliative, etc etc in fact, I think by the time I was leaving they stopped performing cervical ESI due to a few bad complications.
perhaps if anesthesiologists came and did PMR ran pain fellowship that would help round them out. but realistically these programs need to be well-rounded to hit all the bases in 12 months. I wouldn't want to, but I feel like I could have had another 2-3 months of anesthesiology oriented pain just to round out my education.