For example if one cannot be bothered to use, or does not have a corkscrew handy, a screw cap might be preferred for some.

I know it is difficult for most Modern Americans to use a corkscrew. Even more difficult is being able to appreciate the complexities and effort that goes into making good, traditional wine. Best to do away with tradition for the sake of convenience.

PFAS are a specific family of chemicals unsuitable for this application.

No significant amount of microplastics is likely to develop from the mild abrasion of opening and closing a wine bottle a handful of times. And if your risk tolerance is so low that you are worried about that largely theoretical concern, you probably should not be drinking wine at all (because we have quite concrete evidence that alcohol is unhealthy -- unlike microplastics).

I would be (much) more worried about chunks of plastic getting in my wine from those fake cork products than from screw tops.

I think research has shown that simply storing acidic foods in contact with plastic causes micro plastics to release: https://pubmed.ncbi.nlm.nih.gov/37343248/

This isn't a huge deal, because a separate tool made specifically for resealing wine bottles is better than either. But if you don't drink a whole bottle of wine at once, and you don't have such a tool, cork reseals better.