Why is installing programs in OS X sometimes unfriendly to newbies?

I often see new OS X users struggle with a simple task such as installing an application. Why doesn't Apple just make it simpler (or at least set some guidelines for 3rd party devs) to use an OS that's supposed to be the most user friendly OS there is?

Confusion #1: When they download a regular DMG file, and Finder.app pops up with the application that's supposed to be dragged to Applications. However, Applications is nowhere to be found, and clicking on "Finder" again does nothing.

Confusion #2: An application is downloaded, he/she clicks on the file since the Downloads icon was bouncing. But that this point the actual Finder window sometimes pops up in the background, behind the browser. A lot of newbies just sit around waiting for minutes, expecting something to show up.