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We were talking of actual single user systems in practice, tablets, smartphones and similar are usually single user devices and even in corporate many laptops are used as desktop replacement by single employees...

You mentioned PCs originally, hence the confusion.

In any case, I believe Android uses the multi-user features of Linux as a security mechanism (and building a new kernel from scratch might not have led to Android being a major player - ARM companies already knew how to write device drivers for Linux), although it could reasonably use an object-capability system under a more focused kernel.

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