Yeah, that makes the profiles essentially useless as a security measure.
You can still use it as a convenience--you can add sideloaded books to any profile's Home page, so that you could peg all/some of the children's books to the child's home page, making those the ones that show up on the home screen. This would be different than what would show up on your home screen. But you still need access to the library to do that--and as far as I have been able to tell, you can't pin it to the child's home screen and then remove access to the library without all sideloaded books disappearing from the child's home screen.
The only other way I can think of to try to do something similar is to keep content you want to remain segregated on separate SD cards, and change them when you switch off. I haven't tried this, but it should work. Quite a kludge, though.
--Philistine
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