Yes, they do. And allowing third party app stores and browsers only leads to more security and privacy issues. No one is saying that Apple apps don't have issu

Yes, they do. And allowing third party app stores and browsers only leads to more security and privacy issues. No one is saying that Apple apps don't have issues. The point is that allowing more entities to make and run these apps on iOs will just make it worse. And having security issues in app store or in a browser is a far more problematic thing than a security issue in a random app. Especially if the app store or browser is run by someone that is not Apple.