As someone who grew up in a European country where we don't get long summers, I suffered no demonstrable issues from the lack of sun nor did the many around me.

My family wasn't rich so food was reasonably nutritious but not perfectly balanced either.

Vitamin D supplements are sold widely, including in smaller supermarkets like Lidl and Aldi. And one imagines it all comes out of the same few factories.

There will be some who do need it, but not as many as are led to believe they do.