Not sure on the dust killing computers, most computers are or should at least be sealed I would have thought. Most solid state components and whole ecu's should be resin filled as well so not sure on that one but I'm not an expert . May be when they first came out that could be true.
I think we could be straying off the subject here as the main thread was about technology in 4x4 and not drive ability but I do agree you can take a 2wd just about anywhere you want to go,
Personally I have a 4wd to tow as I wouldn't want to have a 1.5t vehicle with 3 t behind it....just seems a bit unequal.lol . ohh yeah then I have one for a bit of fun as well...hahhaha
Anyway, vehicles are certainly not build like they used to and never will. Technology is here and will only advance so not much we can do but enjoy the benefits.