Ferrari had an exclusive deal with Bridgestone that the other top teams didn't: https://au.motorsport.com/f1/news/the-bridgestone-and-ferrar... # The Bridgestone tire was superior to the Michelin.

They all could, but Ferrari built their car + strategy + drivers' style for multiple fast laps with multiple pit stops as the winning formula. Having just multiple tire changes without the same car, strategy and driver won't have the same results