It's hard to blame them for making such a poorly designed aircraft, it was only the 1970s. Today we understand that making things that last for extremely long periods of time and that can be properly maintained is just not effective for the manufacturer's cash flow.
Aircraft manufacturers are starting to learn proper design techniques from the automotive sector, but the uptake is slow. Complex and unreliable systems are the way to go. Said systems should be almost impossible to replace and third parties should not be able to produce similar components due to government legislation. Insufficient numbers of replacement parts should be produced prior to manufacturing being shut down.
Is that the smell of burning electronics? No, it's the smell of a vibrant and functional economy.