I agree. But, as with the full-frame R models, the adapter, buys Canon some time to flesh out the lens options for any APSC model in the RF Mount. Canon didn’t have any ultrawide EF-S lenses for several years after introducing crop sensor DSLRs, and something like a budget RF 18-45 or 18-55 might suffice at intro for a crop R body.You’re correct, I suspect the argument is that there should be native lenses for RF. if Canon does release and APS-C RF body, no doubt they will want to sell lenses alongside of it. And charge a premium even at the low end for those who want the native mount.
The EF 50/1.8 costs $125, the RF 50/1.8 costs $200.
Particularly if the camera is aimed at the entry level (APS-C usually being cheaper), people upgrading from an M may not want to adapt EF/-S lenses, especially if they have to buy those lenses new and also the adapter.