As an easy answer: the fewer parts there are, usually the less there is to potentially break down. A more classic style of toaster can be as simple as a heatin

As an easy answer: the fewer parts there are, usually the less there is to potentially break down. A more classic style of toaster can be as simple as a heating element that's triggered by some kind of mechanical timer you set contained within some kind of container. There's much less that can possibly break down with age and burn out. There's no internal sensors, multiple buttons and electronics that can burn out, maybe some sort of WiFi component that might mess up, and more that can go wrong. Additionally with fewer parts, the manufacturing quality can hypothetically (but not always) be better. It seems easier to get the manufacturing right on a machine with 10 separate components versus say 60.