It seems the control ring (on a RF lens or on a EF/RF adapter) is becoming a "love it or hate it" item.
I have a couple of the "plain" adapters and one of the control ring adapters which I leave on the the three EF lenses I sometimes use on the R and R5. Since I most often shoot using Aperture Priority, I thought that a ring might be helpful for quickly setting the aperture. However, with the three R5 body control dials I find I'm usually using my right thumb for quick aperture selections and using my left hand for zoom settings or to just support a long lens.
When using a long lens hand-held, having to move all the way back to the lens mount to reach the adapter control ring is slow and inconvenient at best, so I've found, for me the adapter control ring has little value.
On the other had, I do usually set the RF lens control rings (at the very front of most RF lenses) for occasional ISO changes and find that is handy on long lenses. It is an "interesting" R series feature, but I'm glad they decided to offer adapters "with or without".
