For the record, there are no "secret" loudspeakers. There is a cabin noise processor in these cars for engine sound that comes through the audio system, if you don't like the sound, just unplug it. Most of them are in the trunk of the car or behind the dash.I know what you mean, but that still should not stop us from criticizing marketing decisions. For example I would probably never by a Porsche, even if I had the money, but I will always say that I hate that fake motor sounds. They (and other automakers) have built secret loudspeakers into their cars that produce the motor sound some customers want. I will also criticize that some luxury apartments cost millions of dollars, but you can't open any windows there.
You say that not having to use an adapter is already good enough for some, but then I have to ask why people, who use their cameras for sports or bird photography and will never use a lens that profits from the shorter flange distance of the RF mount, are also forced to switch to the RF mount, as Canon pretty much abandons the EF mount. Those people probably already earn a 600mm EF lens and now they might learn that they have to switch to the RF version, because the EF version might explode, if you use it with an adapter. What advantage does a sports photographer really have from the RF mount? Wouldn't he prefer a mirrorless camera with an EF mount, which would allow him to keep all his long telephoto lenses? For me it feels like a kind of blackmail by Canon. They only give you all the advantages of a mirrorless camera like IBIS and the much better autofocus, if you switch to the RF mount. Of course that is their way to generate the most money, but it may not be in the interest of their loyal customers.
Secondly, anyone that uses a big white lens professionally knows that adapters and teleconverters are the weakest link, and it's up to the shooter to decide whether or not they care.
Thirdly, Canon isn't blackmailing anyone, you can continue to use your EF glass for as long as you want. The fact is the EF mount has limitations, and IBIS (the way it works with lens IS) and autofocus can be affected by the EF mount protocols when comparing them to the RF mount. The EF mount is also a 35-year-old technology, I think it has run its course and no one should be too upset that they have moved on.