Yes, but I will let the contoller side of this forum respond.
From the pilot side, here is my experince that the controller needs proficiency. When I was gettting my IFR rating, I would fly from the STL area to SPI to practice IFR approaches. The SPI tracon asked if I would accept an ASR approach for controller proficiency. Of course, I accepted, both for the conntroller proficiency and for me to get familiar with that type of approach. After that experience, I would always offer that I would accept an ASR approach as one of my various approaches when I went to SPI if any controller needed proficiency training.