I like the idea of the ultrasonic ROA, but the ROA door-logic system would be a kind of pain in the but. Hopefully it will be possible to disable it in the settings: https://www.greencarcongress.com/2019/08/20190802-roa.html
I would hardly notice another message on the console after power-off. But it's not a terrible idea to indicate that you might have left something on the back seat based on simply using a rear door before the current driving session, your groceries, a laptop, or perhaps a baby.
I was thinking like "dog mode " w/Tesla but without the glitch: https://mashable.com/article/tesla-dog-mode-bug/
