>> The important piece missing from both of these comments IMHO, is that sunburns are the problematic piece.

>Then the problem is light skin tone, and the advice to wear sunscreen always, only applies to them, hence my doubts.

My view: sunscreen for any skin is not healthy, lots of marketing there. People with sensitive skin to sunlight( generally light skinned folks but not always) should either avoid harsh sun of wear clothing that will protect them from harsh sunlight.