O.K., I see the theory behind what you are saying, but I don't understand how it can work in practice.
The average person doesn't know that there are class 0, class I, and class II appliances, much less understand or care about the differences.
All he knows is whether the plug on the end of the cord fits the outlet so that he can use the appliance. If the plug fits and it works, he will assume that all is well.
For so long as class 0 devices remain in service, surely the only way (practically speaking) to prevent somebody using a class I appliance with a grounded case nearby is to not install any Schuko receptacles but revert to having all non-grounding outlets.
