I'm repairing corrosion on aluminum hoods, and tailgates, on different vehicles. on a fairly regular basis.
It's not uncommon to see it in my area, when they are repaired improperly, and or over 10 years old.
Aluminum body panels are very susceptible to something called fiiform corrosion, which is a type that travels under the paint and creates large blisters in the paint coatings.
The quality of the paint system used both at the factory, and during a repair, particularly the undercoats, (that would be the primers, and sealers), are critical to the protection against this type of corrosion.
While I have not as yet, seen corrosion on an aluminum F-150, if Ford uses the same paint system they have been using, I have no doubt it will eventually happen.
Aluminum parts do not pit, or perforate as badly as steel panels. But, they are far less repairable, from collision damage.
I have repaired some minor, to medium sized dents on aluminum F-150's. The panels are more difficult and time consuming to make flawless repairs on. This has always been a problem with aluminum panels, because they tend to flex a lot more than a similar steel panel. If the panel moves as you try and sand it, it's not going to be easy to get all the waves out of a repair. This means you could need to replace an aluminum panel that would have been repairable, if it was made from steel.
It has a lot to do with how particular you are. Many customers are oblivious to ripples, and waves. Some don't even see substantial differences in color mismatches.
Others have very discriminating eyes, and are all but impossible to please. Those customers will be more likely to be dissatisfied, with their aluminum truck after a repair.
A repairer needs to take additional steps to properly treat and paint aluminum panels, during a repair. Many shops will regard this as unnecessary, and skip them to save costs, since cutting this corner this will not be known right away.
While the biggest factor in the quality of a repair is the person doing it, there are factors that can tie the hands of the person doing the repair, limiting what is possible.
So yes, the aluminum bodies will not be full of holes in the same given period of time, as a steel truck will. But, there is a trade off. It's still going to have ugly paint blisters, more serious body damage from wear and tare, repairs that will be more expensive, and probably not look as good when they are finished.
As long as you realize it's not a perfect solution, you may be happy with it.
