Andrew Huberman has an excellent podcast about the latest data on sunscreen pros and cons, skin care, etc...

Afaik you have some sunscreens that are indeed sort of harmfull in certain conditions, but the more traditional ones are not harmfull but they tend to be less appealing to use, leaving that well known withish look in the skin 

For me is a bit of sunscreen the days I know I'll be under the sun full day, to avoid sunburns.

No tanning oil nor tallow, If I want to have a nice tan for the summer I'll take is slowly over one or two weeks of regular exposure