I spend my days fixing electronic stuff. I repair a lot of electric fence energisers : my workshop is in a small city that is a bit of a 'hub' for a lot of agriculture. Now, I'll get to my point!
I fixed an old unit yesterday, that was over a year older than me. It was built in 1975. The main capacitor was still within spec, and the unit really only needed a new 47nF 'X2' cap and a new mains cord/plug. It could well see the farmer out. I could have sold him a new one, too. I don't expect a new one will still be going nearly 40 years from now, since it is a lot more complicated and its little case with its thin walls is likely to suffer in the sun. Is the new unit built with failure in mind? I don't think so, but it does have to be sold in a market where the alternative products are, so manufacturing costs must be kept down. Price is as important as specifications, quite often.
With a lot of consumer electronics, like TV's, I feel that the 'market' demanded cheaper stuff, and the suppliers worked out that they just weren't selling the better stuff, so they just stopped making it! Look where that has gotten us, now that we can only get cheap & nasty.