I think the most confusing concept in this process for new users is the shortcut inside the disk image because it breaks the isolation metaphor. So, you download a file, and it's something called an "image" which opens in Finder like you'd inserted an external thumb drive. Fine. You open the image, and inside is... Your own Applications folder? Wait, how can the file I downloaded contain all of my apps? This kind of…
I don’t think less advanced users think that deeply about it. They just see “oh, I drag the app to applications”. The main issue I’ve seen is that people try to run the .app from the disk image, or forget to eject the image after moving the app. Well designed dmg drag-drop style deployments will actually put some background artwork with arrows and text instructions telling the user to drag and drop into Applications.…
Nope. It's an app that is simply the .app bundle, skipping the whole historical footnote of a .dmg completely. Once you first run it, it asks if you want to move it to Applications, and promptly restarts from its new location.