Do we practice calling 112? Try that and they'll send real cops after you!
No we don't (the equivalent number in the UK is 999) and they send the cops because its illegal, because they don't want you to do it.
We practice training fixes and pans on 121.5, because (a) it's legal and (b) they want us to. So no cops, because it is a different scenario.
Each national authority tends to take different views and as pilots, we have to respect that, even if we disagree.
I don't like the ways the US uses land and hold short clearances, but if I choose to fly there, then I have to accept it as a constraint.
If you choose to fly in the UK, you must accept our national authorities procedures.