I bet if it were available though many would take up the opportunity.iOS external storage in a useful way is never going to happen. Is isn't a popular feature that is needed by most. If a user really needed that feature, they would have switched to android a long time ago.
iOS and the iPad Pro have many compelling reasons for use over Android. The sum of all is greater than one single use. The lack of files/folder access (being one such single use) is not enough to tempt users to Android. As such we shouldn’t expect it to hold any reasoning to change from iOS to Android.
Apple introduced the Files App recently. I would have thought they also intended to exploit it’s potential when iOS 12 was introduced. However, as we know Apple changed their plans and instead of new features they made iOS 12 for stability. Therefore one would assume iOS 13 is going to be the next big thing.Since most aren't switching to android, apple is probably thinking it isn't a killer feature.
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Privacy.
Seeing as the Files app is now onboard it would be a logical move to presume it will be given greater access.