It doesn't have to ask were to install since you choose that when dragging. An app can ask you for preferences when launching for the first time. If an app need to ask more questions Mac OS X have the ability to use an installer script more like the one Wndows have. Some Mac OS X apps therefore have a package installer that launch an installer that go through these steps. Apple promotes the drag and drop inatallation as the prefered one. It is simply the easiest way to go for the user.
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It doesn't have to ask were to install since you choose that when dragging. An app can ask you for preferences when launching for the first time. If an app need to ask more questions Mac OS X have the ability to use an installer script more like the one Wndows have. Some Mac OS X apps therefore have a package installer that launch an installer that go through these steps. Apple promotes the drag and drop inatallation as the prefered one. It is simply the easiest way to go for the user.