Seems like a very niche market for a company at HP's scale. I don't really see them as a consumer printer company any longer. And Roomba-type things are very dependent on floor plans. My brother has a near-ideal layout (single level with no transitions) and it just works so-so for them. Wouldn't work for me pretty much at all even with some changes that eliminate level transitions.

Does your brother often plot floor plans on his house floor?