iPad OS still has a zillion failure modes for the elderly. Long press, split screen and the other multitasking paradigms, multi-finger gestures, touch id, background audio from some tab in Safari... there's just no end of features that can throw them off. And it isn't multi-user.
Not sure if HomeView is the answer, but some aspects of the video were interesting. eg super-fast user switching with no explicit login; and how it puts Siri forward as the primary UI in a way that the iPad doesn't, even if the iPad technically has the same capabilities.
That they drilled a hole through the kitchen island table top for the power cord was hilarious. Exactly zero people in the real world are going to do that.