Low MTBF is why I've tossed all my household robots (Roomba vacs, Roomba floor mopper, and about half a dozen different cat litter robots). They save time T whe

Low MTBF is why I've tossed all my household robots (Roomba vacs, Roomba floor mopper, and about half a dozen different cat litter robots). They save time T when they work, but they create new problems that require 2T to fix. It's a net loss.