Another factor we do not like to look at is design life.
I used to be in the design phase for electronic components. For example, the production line I managed started about 100,000 cell phone chips per day, the main "brain" of the cell phone. The expected service life of the chips was 3.6 years. They were designed to operate 6.2 years. Virtually none of the failed parts that were examined failed due to the actual chip dying. Most were phones being smashed, water logged, battery overcharged, etc.
The chips were not designed to last a "long" time, 10, 20, 30 years, as there was no benefit to the majority of the customer customer base. To make it last THAT long, the chips would be FAR more expensive, and 0.001% of the population would still be using it after operational life (Slim's picture was displayed in the design lab). Most of the phones were out of service after 2 years, due to loss, damage, or upgrades. It is not to say the part WILL fail, it is just that it is not DESIGNED to last forever.
There are a LOT Of parts on the Mustang, not just aluminum, that had a relatively short design life. Seat belts, for example, are rated at 17 years. They may look good, the MAY work, or they may fail due just being old in a 40 mile per hour crash.
We can engineer a loaf of bread to last 2 years without any special action on the consumer's part. The loaf of bread will cost $17 each. Most people are content to pay $2 a loaf, knowing that it will fail in 3 weeks or less, since they do not plan to have it sit around longer than 3 weeks.
ed ay +3112
1968 GT500 Arrest Me Red (The Big Boy Toy)
1966 K Code Vert (The K 'Vert)