I think almost all Apple apps do this, e.g. Photos.app. Which is super-annoying, even though I agree with in in theory. But generally the only reason I am writ

I think almost all Apple apps do this, e.g. Photos.app. Which is super-annoying, even though I agree with in in theory. But generally the only reason I am writing an image to .jpg is to email it to somebody or upload it to some web app and that principled .jpeg filename extension certainly isn't helping compatibility..