Actually that's backwards. It's the shitty bushings that allow everything to flex (sub frame, control arms, differential, all moving different directions) and street tires lack of traction that cause IRS failures.
Slicks or sticky drag radials actually help reduce wheel hop. Once the hop is elimination, sure, you'll snap axles and grenade differentials in a high horsepower car just as well as a solid axle can.
I must have remembered it backwards then. I don't mess with the newer Mustangs anymore, I leave that to my friends, so my experience here is second hand.