I had initially thought the same way -- that the drop in adapters would be the way to go. However, as more RF lenses are being released, I'm seeing less value in it as I'll be transitioning from EF to RF.I've been an R user for a couple of months now. I loved it from the get go and have only loved it more as time has passed and I've gotten nearly all of it figured to my liking. I've been shooting exclusively with adapted EF glass my Sigma 150-600. I feel they work better adapted to the R than mounted to a traditional dslr. I'm holding out for the RP 16-35mm. Also releasing very soon, maybe tomorrow, is the adapter with either the drop in polarizer or ND filter ring. I got the polarizer version preordered. Literally one filter for ANY lens attached via the adapter! I can't wait to boost contrast and saturation on wildlife on very bright days where I can afford the stop in slowness. Eagles beware, lol!!!!!!!!