It's possible to have an open platform and keep malware out. It's possible to go as far as OS X-style sandboxing but allow certificate authentication by more th

It's possible to have an open platform and keep malware out. It's possible to go as far as OS X-style sandboxing but allow certificate authentication by more than one CA. But the track that Win and OS X are taking is to try and create monopolies and control the entire software experience. This is detrimental to the users as well as the developers; try to make a utility app that launches other apps, resizes windows, alters your network connections on a system-wide basis, or includes plugin functionality and put it in the App Store. Trying to make an argument like "oh but users can change the settings and run untrusted apps" is just a huge cop-out because the average user is not going to do that ever.