I would be shocked if a pain management doctor is doing a microdiscectomy. Despite being hugely common and taking less than an hour, it is not a particularly simple surgery. What do they do when they cause a huge ventral durotomy and avulse the nerve root with the drill?
Perc SCS is not that difficult. I did them mostly unsupervised as an intern but there is a fundamental difference between surgeons and non-surgeons. Having revised a number of them for infections and wound complications I know I would never refer someone to a pain mgt doctor for a full SCS/pump implantation (trials are a different story, they do fine with them and can keep them).