About 2 decades ago, most of the Derms in Wino Country declared war on any sunlight skin exposure,
They wanted people to put on sun blockers after showering and again during the day to avoid any sunlight on the skin.
Besides the sun blocking, they wanted their patients to wear wide brimmed hats, long sleeve shirts/blouses and heaven forbid no shorts/tees or swim suit during sunlight.
These Derms were not by themselves. They were part of a nationwide anti sun religion.
Since then, we have seen increases in cancers associated with low Vitamin D levels, Parkinson cases, D2, brittle bones in women and men and allergies/asmatha in children and adults and many more diseases often linked to low D levels.
I can remember good Internal Medicine and FP docs being concerned about the lack of Vitamin D due to sun light blocking throughout the day. It appears that they were correct re the religion of no sun even in moderation has/is taking a terrible toll on people.
I think recommending supplements has probably become part of the standard of care in pediatrics like using seat belts or bike helmets.