I strongly doubt that there is a significant cultural difference between the two, in terms of car culture.
My blotto California brain went 'no! no one is touching my car!'
Well, they don't sell well in the US, but they didn't sell well prior to DEF, so I don't think you can pin the blame on that.
- You can let the tank go empty and not turn up to the workshop for the fill up, how does disallowing to top it up yourself prevent that?
- Many current cars with AdBlue will flash increasingly annoying warnings at you, and although many people drive with check engine lights lit, running out of urea will display you a counter of remaining kilometers and the car will simply refuse to start when empty. Again, nothing to do with whether you push the car to the dealership on foot or fill the tank yourself from the bottle (and actually, there are very foolproof anti-spill bottles, which let the liquid go only when tightly screwed onto the DEF tank).
Yes it does, since it affects the design of the vehicle. Remember that the context of this thread includes:
"So the tank needs to be large enough to cover a full maintenance interval...or creative solution to limit consumption."
If it's really a question of forcing people to refill the tank you could have the engine refuse to start if the tank is empty.