Many many services doesnt reliable with VPN. e.g. UDP based streaming without MTU configable.You can still set up a VPN to route your public IP.
I specially applied the static public IP on LTE, I confirm it works. But l need a USB modem for my application.The mobile provider don't provide public IP address, so you can not use functionality of public address, remote access to router, port forwarding etc..
No, I'm still waiting for VirtIO support in v7The most CCR for BGP would sorted out before they will release v7
so the problems also resolve themselves, no more need for ROS v7