What's up with these new rotors?

Simple. Too loose- they fail
Too tight-they fail.
Lack of maintenance -they fail.
Old cup/new cone-they fail.
Two different brand parts, ah, the horse is still dead...
My 80 power wagon (10 years plowing snow) 470,000 km’s on it still running original wheel bearings,i have owned truck for near 30 years.