Your view is a bit narrow. I still have my M6 II and my M3 and will likely keep them for some time as I have all the M series lenses and a number several MF M mount lenses as well as an FD to M speed booster. That said, the M6 II has one glaring fault and that is the absence of EFCS. The mechanical shutter is harsh and causes shutter shock problems in way too many situations. I gave my M5 to a granddaughter and now I miss it, both for the built in EVF and EFCS.
When it comes to features and capability, the R10 and R50 completely outclass the M6 II and the M50 and that is not even to mention the R7 ( or video). As to lenses, the basics are pretty much the same. The RF 18-150 is a virtual clone of the EF-m 18-150, albeit a bit sharper in my experience. The RF 10-18 is smaller and lighter than the M 11-22, but similarly sharp. I would agree that the 18-45 is a bit on the sleazy side in that it doesn't go to 15mm, but the IQ is not terrible.
Now when you get to primes, the selection is a bit different, but far from "garbage". The RF 16mm f/2.8 is an excellent crop lens and tiny. Ditto for the RF 28 f/2.8 and both are cheaper than most of the EF-M lenses were. The RF 24mm and 35mm 1.8 IS macros are excellent lenses for crop frame and are similar in size and weight to your Sigma 30mm and not very expensive. Your Sigma is a bit faster, but without IS, so for many uses, the 24 and 35 is will outperform it. Lastly, the RF 50mm f/1.8 a competent longer lens and very cheap. If you are hung up on the RF-s label, maybe you should look around and see what is really available to use on RF crop cameras. The choices are a bit different than they were for EF-M and we would all like to see the excellent EF-M 32mm f/1.4 come across to RF, but the choices that are there are not by any means "garbage" and most of them are portable to FF. I have found the R7 to be a truly outstanding camera and I guided a neighbor on a budget into an R10 and it also has very deep capability for stills. At first experience, the AF is the difference that just jumps off the page at you, but there are many more subtle features that make the RF crop bodies all around better cameras than the M series (you really miss true point focus when you go back to an M)
Lastly, when it comes to telephoto lenses, there is little to no gain in making crop-specific lenses thanks to the diameter and length constraints of tele lenses being functions of f stop and length (i.e. magnification) as opposed to sensor size. In that context, the RF 100-400 is very good, very small, and not very expensive. There is no lens for M that is even in the ballpark.