while "sabbath mode" does indeed seem to be real, i cannot imagine this is something that sees any serious amount of usage, and i'd imagine most rabbis would tell you it's kind of silly because the point of sabbath is to not do work, and these appliances specifically exist so we don't have to do work.

If you start considering "putting food in the microwave and turning a dial to start it" as violating sabbath, you quite obviously then also can't go around turning door handles or using keys, or taking on/off clothes, or filling a glass of water, etc etc etc