A simple example of useful stuff than can be done today but is annoying to set up is to have all the lights in a home turn off when everyone is gone, but switch

A simple example of useful stuff than can be done today but is annoying to set up is to have all the lights in a home turn off when everyone is gone, but switch back to their previous state when one or more people get home. Another is to have blinds that open just before sunrise, so that you can sleep in darkness but wake up with the sun (especially useful if you're in a city). This is what I do myself, but it's a pain to change anything because the legacy motorized shades don't integrate with anything.