30 minutes? I did that today for two hours. My arms, legs, face, and neck were all exposed without sunscreen, and I didn't burn at all. It all depends on your skin type.
I do this daily for up to 6 hrs on the weekend. I have never had a sunburn.
You seem to have assumed all humans are light-skinned, which is something the article warns about right at the top.
I stand by my comment and if you do have darker skin you can adjust that time for your case
I don't know what you think "assuming" means. I'm not assuming it. You said anyone should spend 30 min in the sun and see how badly it hurts them.
I can spend an entire day in the sun without being sunburned.
> if you do have darker skin you can adjust that time for your case
This further proves that light skin was a vital premise of your claim (which is false).
Your generalization necessarily can't apply to all skin types
For today's lucky 10,000:
Sure, don't avoid the sun completely, but don't play with it
It's true that sunlight increases Vit D and Nitric Oxide, other claims are much feeble and holy mother of selection bias to claim all that is due to the sun!