I have no intentions of getting a different automobile anytime soon.
Car companies, to be blunt, don't care about what people care about if they don't intend to buy a car. Why should they design cars for people who don't buy them?
I'm just fascinated by automobile knowledge. I'm not sure if any small SUV that gets 30 MPH plus can possibly be BUILT to rival the ride quality of a typical large, heavy automobile.
There are plenty of vehicles that ride nicely. It will be hard to find a car that has the ride and handling of a 70s land yacht, but there are probably plenty of vehices that ride nicely in the small SUV class. A Rav4 LE with its relatively small (for today's world) wheels would likely ride fine. Not Cadillac from the 1970s nice, but certainly nice enough for daily driving.
It seems as automobile buyers always give up something no matter what they choose. I don't want to bother dealers test driving things unless I'm actually out on the market to buy something.
Yes. Every car on the market comes with pros and cons. I don't think that there is a car that does everything (handle like a BMW while riding as well as a 70s Cadillac, for example). Consumers, however, have lots of choices and it's all a matter of priorities.
Right now, the Toyota Corolla Cross interests me as a possible future set of wheels for me but I won't ever expect a magic carpet ride comparable with a big 1970's Chevrolet, Buick, Oldsmobile, Chrysler, Mercury or Ford. I suspect the comfort level would still be above that of my current '95 Corolla sedan.
A Corolla Cross, of course wouldn't have the ride comfort of a large sedan. That's because it's a subcompact economy CUV. When adjusted for inflation, it costs a fraction of what the Lincoln, Cadillac, and Chrysler (that you mentioned in your original post) did. You are comparing apples and oranges.
I dream of the perfect automobile or wagon. Does the human species today have the technological know-how to build what I envision?
There are multiple problems with this. First, your concept of an "ideal" vehicle is so far outside of what the vast majority of consumers today want, so why would a car company spend a fortune to develop it given that it's not going to sell. Second, you've already mentioned that you have no intention of buying a car, so as I mentioned earlier, car companies couldn't care less about what the non car-buying pubic wants.
1. Toyota reliability and longevity
2. Volvo safety
3. 1970's Lincoln Continental magic carpet ride
4. Honda Civic thriftiness on fuel, or an EV that runs on solid state batteries as Toyota is now pioneering
5. BMW handling
6. mommy van roominess
7. won't roll over easily
As I mentioned in your other thread, a modern Toyota Crown Signia satisfies most of what's on your list, and would likely be closest to what you envision as a perfect car. It's got #1, #2, #3, #4, and #7 down pat. It's pretty roomy in the cabin and cargo area, so it's probably close to your ideal version of #6. Your #5- BMW handling, isn't really all that compatible with some of the other items on the list. A car that rides like a 70s Caddy isn't going to handle like a BMW. Unless you are going to pay big bucks for a luxury car that has a fancy and effective adaptive suspension (which would sacrifice #1 on your list, because those systems are not reliable long-term and cost a fortune to repair), you're out of luck.
But going back to the main point here- you have no interest in buying a car, so automotive companies don't care what you think. That might sound harsh, but as long as you continue driving your 1995 Corolla and aren't interested in upgrading, they simply don't care. They care about the millions of Americans that want a SUV.... so that's what they build and sell... and they are making tons of money doing it.