The problem is mostly that Openvpn is responsible for setting up the routes that forward all traffic through the tunnel when it starts, and to remove them when

The problem is mostly that Openvpn is responsible for setting up the routes that forward all traffic through the tunnel when it starts, and to remove them when it's done. Openvpn only secures your traffic when it's running. When it somehow quits, you're on your own. My experience is that when it merely loses the connection, Openvpn will try to reconnect, and in the meantime you have no internet. It won't fallback. But sometimes, when the problem is more serious, the openvpn daemon can quit and then it becomes dangerous.