I can't be bothered with a spare on my Porsche. In 12 yrs of driving them, I never needed it once.
In other news, one of my field service trucks got a flat tire last week. The tech changed the tire but the spare stem failed and she would not hold air under load. Had to get a tow anyways.
We always carry a spare on these trucks and needing them is rare. Needing them and having the spare fail is more rare but it happens.