That would solve a lot of problems. Now developers typically make a free version of their app, but Apple restricts how those can be used. They can't have grayed

That would solve a lot of problems. Now developers typically make a free version of their app, but Apple restricts how those can be used. They can't have grayed out buttons representing features available in the pay app, and can't be time limited. It can be hard to feature limit it and still have the free app be neat. Our app has an offline data store of maps on the phone, so it's additionally painful that when people 'upgrade' to the pay app, they have to redownload all their data.