I use them just fine on my bicycle.
I agree with everything you say but you're missing a key point - the active hostility that a significant number of drivers have for bikes.
I biked in Canada for ten years, and drivers there (at the time) were mostly indifferent to bikes.
(And yet I say this, and then I remember that one of Canada's rising bike stars at the time was permanently paralyzed by a driver who had repeated tried to force him off the road before (in his small community) and who had been reported to the police many times for it, and yet suffered no penalty other than a temporary license suspension. This was in the early 80s, and I haven't thought about it in 30 years, but I still feel a rush of rage.)
Now I live in the Netherlands, and cars are actively solicitous of bikes. Let me tell you that the center of Amsterdam has a lot of cobblestone streets with no separation between bikes and cars, not even a line on the street, but (nearly all) the cars treat cyclists as if they are delicate and breakable, which is actually the case.
Cyclists keep getting promised the world around the country. I’ll believe it when I see it.
Some long distance trains you can pay for a private cabin with decent meal service, or just a single seat and access to a vending machine.
Wikipedia confirms that distinction is sometimes made.
If you can't bring yourself to solve your parking situation after spending 200k on a Bentley, you spent too much on the Bentley.
To this day, I've never seen a Valet Full sign.
The problem is that as a passenger/consumer, with a car, it's very easy to decide how much to pay for my own personal level of ride quality.
I can spend $2k on an old Camry, or I can spend $200k on a Bentley, but either way, I have almost total control (potholes notwithstanding).
It's really not possible to have that kind of personal control when you're looking at public transit.