Marketing observation, I would pay dearly for a Halion upgrade (e.g. the full library) on the iPad. With a 8GB/16GB iPad pro, and probably some lesser brethren, it seems like a possibility to get the bigger library in there, and Halion is one of the lightest libraries I’ve got anyhow.
The built in library is excellent, but it seems to me there’s an opportunity for an additional revenue stream in app purchase.