You are responding to a post which is two years old.
In that time, SmartThings did release a version of their hub in Europe which uses the European zwave frequency.
I suggest you look for more current resources before drawing conclusions about any home automation systems – – the technology and offerings are changing very rapidly these days.
As for why there are different frequencies in different regions, that’s not the fault of the Z wave alliance. Different countries have chosen different frequencies for use with their mobile phones and emergency responder communication systems. This is why a mobile phone purchased for use in the United States does not work in the UK. The zwave alliance had to select frequencies which would not interfere with these local reserved purposes.
Certainly you can go with zigbee if you prefer, although it has its complexities as well.
