Nothing like those national health systems!
It's lawyers. When an action becomes preventative one can still be sued. So, do nothing and react to the problem when it appears.
My wife has been trying to get pro-biotic treatment instituted in her NICU for years. The docs are afraid of the lack of supporting data. So they all stare at each other wondering, 'Who's going to do it first' while pre-term babies get necroizing entero-colitis (NEC) and die.
I've had it with the presumption of "do no harm" because, too often, it's harmful.