I think you hit the nail on the head. I'll add that I think the S30's are very well engineered cars that can be worked on with a good set of metric tools and without many specialized tools. My 280Z also doesn't generate the same level of frustration of other older cars that I have owned. Caution: I may be biased and have an unnatural love for Japanese cars. There's no cost cutting measures that are prevalent in American cars (nothing frustrates me more than finding something stupid, like a $75 relay buried behind a dashboard assembly or door handles that just fatigue and break repeatedly, or overheating problems that never go away), no inherent complexity or need for special tools like German cars require, or reliability issues with other European makes. The only issues I have found is that my clumsy, large American hands are often too big to fit in small spaces.
I think I said it before, but Japanese cars built up to around the mid-1990's were probably the pinnacle of automotive engineering, and that likely started somewhere around the time of the S30. Unfortunately, this golden age ended in before the new millennium, when Japan started playing the same game that all the other manufacturers do now, with impossibly difficult maintenance items, needless plastic and foam rubber coverings in the engine bay, technology that becomes obsolete in a few years, and components with limited lifespans only designed to last until the warranty expires.
It is a joy to open the hood of the 280Z and just look at the L-series inline 6. I also love explaining to my kids or whoever else will listen what each component does and how it functions. I have become somewhat of a self-taught expert, using my mechanical aptitude, reading the factory service manual and fuel injection bible, and also with the help of the great members and resources of this forum. They no longer make cars like the S30 and never will again, which is why I intend to keep mine alive and driving for as long as I am able, as well as trying to cultivate and grow interest with my kids. The next generation will likely not understand how to drive a car with a manual transmission, or without backup cameras, blind spot warning lights, lane assist, traction control, power steering, and all the other electronic nannies that are present on modern cars.