Extemely serious issues affecting Macs

Let's try to summarise the key features of iOS:

• No user-accessible file system, almost every app is completely sandboxed and can read or write only to its own files
• Apps are launched via a grid of icons
• Only apps vetted and sold by Apple can be installed
• Apps auto-save their files

Feel free to add additional points and then explain which are also present in OS X and are mandatory.