iOS: first true OS?

According to this A+ textbook, the four major functions of an OS are:

• Provide a UI;
• Manage files;
• Manage hardware;
• Manage applications.

So, is it me or was iOS the first one to actually manage b), c) and d)? Previously, it seems, we (the user) were the ones assumed to be in charge of managing those. I understand I’m taking the above quite literally but I can’t avoid wondering if Apple isn’t really on the right track to creating the next-gen operating system and not just another operating system. If anything, Microsoft’s tentative approach to Windows 8 and Metro is a clear evidence of this…