I believe this to be a category error. The Newton is not a technology with a format that died with it. If it was no longer possible to press the buttons or use the screen on a Newton, or that you could only create lists of things that existed in the 90s, the comparison would be more apt.
There was some 3rd party development of applications, and presumably there would have been more if the Newton had thrived. But, fair point, it was mostly a product, and just potentially a platform.
