Charlie wrote in post #18707231
considering that the new RF lenses have more pins, there's got to be some scenarios where they would perform better than adapted. If that is the standard you are going by, then adapters will inherently have reduce performance COMPARED to RF lenses. Canon has indicated that the RF lenses transfer data faster, and that alludes to adapted lenses not being up to par of native lenses by design.
being canon with canon adapters, performance is likely "good enough" and "practically native".
Rereading your original post, I see you were talking about lenses with adapters not performing as well as native lenses. That may be true. If Canon can achieve better performance from a native RF lens on an R body, that IMO is fair game.
I inferred that you were also saying that some amount of this reduced performance was intentional, but I might have misunderstood your meaning. My post was that intentionally making an EF lens on an R body, using Canon's adapter, perform worse than that same EF lens on a comparable EF body (say a 6Dii or 5Div), in order to encourage the purchase of RF lenses, is a risky game for Canon to engage in.