I don’t think the Expedition example works b/c Expeditions aren’t driven the same way as the Mustangs are (I hope). Also aren’t Expeditions built on F150 frames? I think the F150 is built ‘Ford tough’ while a Ford car may not be

The Camaro is not a fair example b/c it’s a redeveloped product that was previously uncompetitive. Love it or hate it, the Mustang has always sold well so you have some Ford engineers saying don’t fix it if it ain’t broke and the Ford money guys focused on other things (Volvo, Jag, other brands) and other markets.

Regarding the driveline stress, are you considering the aspect of sudden change / stress? I.E. is a stoplight clutchdrop start the same as pushing 2-3 tons of SUV or towing a boat?

I would love the Stang to have IRS but a combination of tradition and pennypinching will block it