Ragnick moving to a place like Chelsea or City with unlimited money wouldn’t be good exposure for his brand of “genius” because those systems are already in place.
Bayern? They don’t need him.
Barca? Broke and also lol.
Juventus? They routinely bully small clubs into giving away their players at a discount.
Now otoh if he moved to Newcastle with unlimited money and a chance to make a name for himself as the guy who rebuilt a club.!