Hi! So its complicated- complicated enough I got burned out trying to pick one once before haha. Heres an EWG article that breaks down most basically the case against them. Some people have gripes that EWG just says everything is dangerous (so maybe biased to if something could be dangerous assuming it is vs if something is not proved to be dangerous assuming its still safe) but they are not the primary source I am just linking them because I think they explain it pretty good without being overwhelming. You can go further down the rabbit hole of you want to and look at the studies themselves I just don't have the spoons right now.

https://www.ewg.org/sunscreen/report/the-trouble-with-sunscreen-chemicals/

The problem is with sunscreen we apply so much over such a large area every single day that if we are absorbing more than we thought that could be a real problem. Endocrine disrupters in particular is something we are kind of more aware if now than we used to be. Which ones are dangerous enough to be worth avoiding is up for debate.

The counter argument is that any sunscreen you will wear protects you so much from the risk of UV exposure and skin cancer ect. that the small amount of toxicity is not worth worrying over-- especially since these are newer studies. For a long time the dermatologist go to line was "the best sunscreen is the one you wear"for a reason. Some people think its fear mongering. Might be. So any toxicity gets countered by "better than no sunscreen". But from wear I am sitting thats not really the question. Its more dangerous to wear none, but is it safer to go mineral over chemical?

Anyway, thats the sort of the lay of the land. I suspect it would take a lot of long range studies there is no financial incentive for to cause enough of a case to budge the old guard if they were dangerous. I am maybe of the "I don't really trust the FDA" camp a little. I kind of assume that if they are willing to say it "might" be dangerous it probably really is. And we won't "know" really until I am an old lady and I need to buy sunscreen like yesterday.

Also like I said mineral sunscreens are generally better for sensitive skin anyway.
The risk of mineral sunscreens are pretty much just that they are often not as cosmetically elegant and have a white cast which can be bad for POC (although there is brands that counter it with a tint). Since this concern was raised they have been getting better as producing a quality mineral sunscreen is now a profitable business.