I agree that there are pros and cons to each generation of our trains, but I don't think one is really better or worse. When it comes to the electronics, there is really nothing high tech in modern engines... anyone that has passed a course in basic electronics can reverse engineer these things and do the board level repairs that are offered by certified techs. the knowledge is just different than what is needed with post war trains, it isn't any harder.
As for the car analogy, I think it follows quite well. Guy1: I can work on my old car. Guy2: I don't have to work on my new car. As someone that made a living working on cars at one point I can assure you that the nuts and bolts are the same. If you know how to change a water pump, or transmission, or instrument cluster, the job is essentially the same on a 65 Mustang and a 2015 Mustang. Things do get a bit other-worldly with hybrids and electric cars, but that is an entirely different beast. in the end, the point is that you had to be able to work on your old car because it required a lot more routine maintenance. you don't need to know how to work on the new car because it does the adjustments on its own, and it tells you exactly what is wrong when something breaks. the same is true for modern engines. There is nothing (qualify this, as you still need to lube and such, but just talking about the control system, not the mechanics) in them that requires routine maintenance like what the PW stuff needed.
Sure, PW stuff is easy to understand, but the electronic stuff is not actually difficult to understand either, if you want to learn it. To quote my favorite historian, James Burke, "Never before have so many people understood so little about so much." but thanks to the internet, among other things, the information is out there, easily accessible, for all of us that want to understand.
JGL
"...And that, if they are to have more say in what happens to their lives, more freedom to develop their abilities to the full, they have to be helped towards that knowledge, that they know exists, and that they don't possess. And by helped towards that knowledge I don't mean give everybody a computer and say: help yourself. Where would you even start? No, I mean trying to find ways to translate the knowledge. To teach us to ask the right questions. See, we're on the edge of a revolution in communications technology that is going to make that more possible than ever before. Or, if that’s not done, to cause an explosion of knowledge that will leave those of us who don't have access to it, as powerless as if we were deaf, dumb and blind. And I don't think most people want that. So, what do we do about it? I don't know. But maybe a good start would be to recognize within yourself the ability to understand anything. Because that ability is there, as long as it is explained clearly enough. And then go and ask for explanations. And if you're thinking, right now, what do I ask for? Ask yourself, if there is anything in your live that you want changed. That's where to start."
- James Burke, Connections (1979)