Personally, "open source" is very low on the list of things that would convince me to pay several thousands dollars extra per appliance. That's just way too much money for something like "avoid pushing the buttons or getting up without needing third party servers." I'll just push the buttons, thanks.

Even just paying multiple times more for reliability in the forms of quality components is a hard sale. What if I move? Do I want to have to bother trying to take it with me and potentially replacing it for the next buyers? What if a new dishwasher in a decade is as much better than this one as this one is compared to the one I had ten years ago (seems unlikely, but possible?)?