alot of us here using china set... i have no issues so far. this one maybe ask someone using A3003 to comment, but according to some of the A3003 users, they say no difference in coverage.
So only difference between this both is the 4G and 4G+ and the charger it comes with (China set comes with china plug, Europe either comes with 2 pin round head plug or 3 pin plug)
normal charging still works, but just that if you want dash charging, you need to use BOTH the charger and cable provided by oneplus in order for dash charging to work.
If you swap the charger or cable to another one, still can charge normally, just no dash charging