My old diesel cars, MKIV VWs, and their computers work really, REALLY well. No computer issue at all. And, the computer is actually able to inform me of errors.
I'm no techno-head, but I'm also not a Luddite (though I've tried!).
No ECU update on my tractor. No issues. And, being newer, it's quieter and doesn't stink like older non-ECU equipment.
Time will tell: my cars have proven themselves (I have five of them in the family). At the rate I use my new tractor I don't figure I'll come to a time that it'll be an issue either.
My truck, and IDI, which can sit for months at a time, has zero electronics (well, it has a GP controller, but even if that shat it'll still start- if need be just plug the block heater in). I appreciate this. And, my B7800 has no real electronics either: it's also an IDI. And my generator, Kubota powered, is also an IDI, though, it clearly has electrical stuff
If I was computer adverse (and I have plenty of reason to be) I wouldn't be typing this here... I once made like Hunter S. Thompson and shot a typewriter!