> fixing all of your issues would not be hard with a modern re-design
I'm not so sure. You could probably make the slot wider, but it's still a 100% analog device that operates via heat expansion of metals. The adjustment is going to be finicky. People expect toasters to "just work" without maintenance.
As soon as you add digital electronics to automate the analog adjustment... why bother with the complicated analog part?
The only major advantage this toaster has over a spring/timer device is that the toast (usually, but not always) goes down by itself. Pushing down on a toaster spring just doesn't seem like that much of an inconvenience.
Have you ever owned one of these things? Did you genuinely like it?