> The argument of our constitutional court is that every single voter needs to be able to understand how our voting system works without being an expert.

It doesn't take an expert to understand that you click on a machine, it prints a receipt which you can verify has the correct thing written on it, and you put that receipt in a box. When counting, the paper receipts can be counted, or used as a statistical check if machines report numbers directly. There's nothing complicated in that.