For Roomba specifically, this is not true. It doesn’t stop working. The app stops working yes but there’s a button on the machine you can press to start a job.

For Roomba specifically, this is not true. It doesn’t stop working. The app stops working yes but there’s a button on the machine you can press to start a job. It’s the same deal with my Anova sous vide circulator, my Nest etc. Their apps requires cloud access yes. But all of them can function without it. source: Roomba 675 / Anova / Nest owner.