We fondly remember the old cars and motorcycles because we could work on them ourselves. We forget that we worked on them all the time. Spark plugs now last longer than the typical vehicle of the 60s or 70s. A compact car of the 60s was doing good if it got 18-20 MPG and we now complain if our 5,000 SUV doesn't do better. We had to replace the battery on our motorcycles every year (or more often) and we now complain if they don't last more than 5 years.
We now complain that it takes fancy equipment to diagnose a problem but we forget all of the stuff we worked on and replaced trying to resolve a problem in the "good old days".