I'm not sure how true this is anymore. An OBD scanner makes the computer work for you. Modifications are certainly more difficult, but repair is easier IMHO. It is vastly easier to go replace the one bad fuel injector on a 2005 than rebuild a carb on a 1983.
Of course it's easier to replace than rebuild. I doubt I would be keen on rebuilding a fuel injector, even an old one. But replacing a carburettor on a 1983 is trivial.
