>I would argue that Apple actively doesn't want to support your two use cases because they'd much rather sell a device to each member of your household and make it incredibly easy to share the page you are looking at between each member of the house.
Bingo! Apple have acquired immense expertise in applying this anti-pattern.
This is what frustrates me about consumer electronics, that if you have a use case that the vendor doesn't want to support then you'll be constantly frustrated over what could be a simple software change.