It's good that every service has separate credentials. For a counterexample, consider Apple and how they try to restrict you to a single Apple ID. They want everything to be tied to a single person. Every service you use is tied to your Apple ID. It just doesn't match the way that people use computers. For example, I get my computer games and business software billed to the same card, and there's no easy way to chang…
Apple considers iPads (and iPhones/Macs) as personal devices. You aren't expected to share an iPad, you're expected to buy an iPad for each user.