One of the reasons I heard that NI is making this a separate add-on is that the bundle also comes with some NI cloud hosting functionality. I'm not sure what it is, and I'm currently not interested in it. But there is probably some additional overhead for every user that takes advantage of that part of the toolkit. It wouldn't be as profitable but NI should have made the WebVI part of NXG, and had the cloud hosting be a separate toolkit on its own.