

The UK won’t allow them at all. Recently, someone imported one elsewhere in Europe. When they brought it to the UK, it got seized as dangerous. Even though it wasn’t even UK registered. I believe several other countries view it in the same light.
I’d actually be surprised if they even fit on a lot of European roads.
There’s definitely a difference between rural and urban requirements.
Analogue goes further, and can tolerate more interference.
Open channels allow others to jump on quickly. E.g. a hunter/hiker listening in, can jump in with critical information on a search and rescue.
Lower density means less people to mess with channels, and generally better radio etiquette.
Open radios are cheaper, and already have the required infrastructure.
Basically, it’s not worth the cost/effort to upgrade. It also provides some extra benefits.