So you're out to advocate that the UK system is better than other countries with Class E?
Personally my only claim is that it works for us. Class E might also work for us too but there is a risk that it won't and sometimes it's better the devil you know.
The UK has no Class E and sits in the top two for route charges in Europe, if not the world.
The old causation must imply correlation argument. There are many reasons why UK route charges are higher than others but not using Class E is way down the list if it is there at all.