TBH, I'm feeling a bit stuck in the middle on the RF lenses. I bought the R with the kit RF 24-105L almost a year ago, seemed like the obvious lens to start with. I added the RF 35 as a small light walk around and splurged on the RF 70-200, well my wife did, for Christmas ( thanks honey).
However I still have 8 EF mount lenses, 4 Sigma Art - 20, 50, 85, 135; and 4 L - 16-35 f4, 70-200f4, 100macro, and the 100-400 II. I have the 5DIV and 6D to use them on as well as the R with the adapter obviously.
The middle ground is I can't justify buying RF mount lenses that are less expensive but probably not as good as my EF lenses, since I already own the EF lenses and I really don't want to pay the premium prices Canon is asking for the "pro" RF glass. The 70-200 was an exception.