What is the purpose of wheel alignment?  There are three good reasons:

Prolong tire life.

Make the vehicle track straight.

Make the vehicle more comfortable to drive.

All alignments are not the same, even on similar vehicles.  An example of this, two Corvettes one driven by a 65 year old man, and the other by 20 year old, both identical cars, but I would guess they would be driven differently.  Does your alignment shop take this into consideration or just "set to spec" or "just toe & go".  Do you use your auto for what the manufacturer intended?  Do you still have tire wear after having an alignment done ? Do you tow a trailer?  Do you load your vehicle?  Do you drive country roads or highway?

All of these are just some possible situations that require a change of alignment settings. 

My alignment experience ranges from daily drivers to exotics & full race prep. 

Ferrari

Corvette

Do you use your auto for what the manufacturer intended?   Do you still have tire wear after having an alignment done? Do you tow a trailer?  Do you load your vehicle?  Do you drive country roads or highway? All of these are just some of the possible situations that require a change of alignment settings.