Maybe Canon sees the EF-M market and the RF market as two distinct groups with very little overlap?
I'm sure the folks here at this forum tend to grossly overestimate the number of photographers who started with an EF-S camera and EF-s lenses ( or at least mostly EF-S lenses ) before beginning to buy EF lenses to use with an EF-S body in anticipation of the time when they would move to an EF body. That's because the typical shooter who hangs out at these forums very likely followed that path.
But that is not the same thing as saying the typical customer who has bought either an EF-S body and lenses or the typical customer who has bought an EF body and lenses followed that path. For every one of "us", there are hundreds of folks who bought an EF-S camera and EF-S lenses (plus maybe the nifty-fifty) and never bought a FF camera or an "L" lens. For every one of us, there were (yes, "were", as in once upon a time there "were") many pros who came to their first FF digital camera directly from 135 format film.
All of that was in the past, though, before smartphones really took off as the average person's primary photo and video capturing device. So what happened and worked then for Canon may not necessarily work now for Canon.
Canon seems to see the EF-M series and the R series as two completely separate markets. Perhaps they will eventually expand the EF-M space to include more enthusiast oriented lenses, but I wouldn't bank on it anytime soon. They seem committed to pouring all of their consumer product (as opposed to medical imaging or other business units that do not encompass ILCs) R&D, production, and marketing resources into the RF line of products. At least for now, they seem to think that the current EF-M offerings will suffice for the customers at which they are aiming the EF-M products.