I was just thinking about this the other day. This is a problem that pissess off a lot of people. Also, the manufacturers stop making parts after 7 or so years making it harder to find replacement parts.
What if a bunch of us started a company that only sold a few models (sedan, truck, SUV whatever). The frame would always be the same, the space allocated for parts would always be the same, the parts would always mount to the same spots, so even if there were improvements over time, because they were given a bit of extra space to begin with, the new parts could be swapped in easily. Essentially you could buy all of the parts yourself and put it together, or buy one pre assembled. This is the big one. NO computerized parts. Everything works on its own.
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