I'm from Texas, and I got the email today, but I haven't used "local" superchargers in over 3 months. I always charge at home anyways unless on long trips. It's insulting to tell me the benefits of charging at home AND accuse me of over-using the local superchargers! Makes me feel like a 5-year old and almost makes me want to rethink an X reservation if I will be treated like this.
They accused you of something? It appears to me a gentle reminder of what they now consider the network for. You can continue to use the network as you have which isn't a lot of sounds like. Don't see the problem.