Re: Anyone else wonder...
"For some reason a lot of readers seem to think that making laws at the highest level is better than making them at the lowest practical level - eg national, in this case"
Multinational Car manufacturers laugh at your tiny divisions. The last thing they want is having to design and market umpteen different models because each country in the EU has different rules. Drivers also aren't interested in having to modify their cars every time they cross a border. They want to know that the car they bought is Spain is legal to drive in Denmark.
And before it's pointed out; yes of course LHD and RHD is a variation. But it's a historical variation everyone is stuck with. We don't need to add to it.