Making your fealty to a monopoly a proud point of personality is a distinctly modern affect.
And as far as “when legally required” that is to cover Apple’s butt when they do it. When legally required reasons can be stretched so thin with modern erosion and national surveillance. They just renewed FISA just got renewed which makes all data technically available when legally required.
Apple only applies enough security to make everyone happy enough to pour money into their bank account, often at the expense of the user and citing that this is best for everyone. It’s not.
That being said, marginal qualitative difference really the story with all possible options except the most locked down, inconvenient, and all but unusable. No one serious thinks that they have privacy because they use a linux distro, for example. No matter which one.