Well , many people don't have , want or can afford the very expensive and heavy EF 500mm f/4 or other Great whites but would like a cropped version of the R6 so they can use smaller , more affordable telephotos like the EF100-400ii and still get decent reach. I'm one and I don't want or expect RF-s lenses.And if they do make the cropped R, there will be thousands of folks in forums denigrating them for not making dedicated small crop lenses. Frankly, I think they will be better off building an R5s for those looking for more reach and enhancing the M line for the vast majority of APS-c users. I find it hard to believe that there are a lot of people who own an EF 500mm f/4L who can't afford to choke up for a high res FF.
I can afford an R7 that's priced about the same as the R6 but the R5 would be a real struggle and would still have lower pixel density than my 7Dii.