ffs there is no nuance

no sunblock is 100% effective

whatever good parts there are, they get through the sunscreen without the risk of cancer

Huh no the wavelengths that are used to produce vitamin D are the same ones blocked by sunscreen. 

If you are scared of the sun and cover your skin all the time you do miss out on healthy UV rays that have all sorts of health benefits

There is always nuance. A truer truth is hard to find.

In the case if sun: vitamin d production saturates in about 10 minutes at solar noon in summer IIRC.

"Whatever the good parts are" is not a fair way to characterize a very well studied adaptation humans have to sun.

Yes, I use sunscreen.

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