This happened to me as well. EU citizen that lived for a while in the UK. What is different is that in Google Play I still have my home address not one in the UK. So even more strange.
I don't think the end user needs to know anything about capacities or other technical details the same way a user doesn't need to know their internet speed.
The end user experience will be having a hot wallet in your computer/phone or online service like coinbase that will handle all the routing, channel setup, etc for you. Like when you use bittorrent you don't need to manually connect to peers, the bittorrent client handles that for you.
When a user opens a channel it has to lock up some BTC. That is called channel capacity because for payments to be routed through that channel (even other people's payments) that channel at least needs to have the same or more amount of BTC available. If you want to route a bigger payment you need to find a channel with more capacity.