This approach of binding our smart devices to our personal accounts may be an easy engineering decision today, but it will make less sense as more devices show up in households with multiple family members. Families shouldn’t be forced to decide if the dishwasher is bound to Mom’s Gmail account or Dad’s. Instead, the household should have its own identity, with different family members having different levels of access depending on their needs.

via How Welcoming Will the Smart Home of the Future Be? | MIT Technology Review.

Not sure why a dishwasher or any household appliance would need user authentication or even user management.  Does it matter if the person doing dishes is authorized as long as the dishes get washed?