There really isn’t any good reason why your average mainstream user should have to worry about which browser version is installed on a given machine. Unless

There really isn’t any good reason why your average mainstream user should have to worry about which browser version is installed on a given machine. Unless you have plugins that may break, or happen to like this or that UI feature that tend to come and go as browser developers see fit. I like the idea of getting rapid updates for bug fixes and such, but don't like that an app I like can be replaced by a behaviorally different app that happens to have the same name. I'm sure there are a number of users who do not want automatic updates, and since browser changes can break Web site or plug-in behavior developers of sites and plug-ins are going to want to know some details about browsers that are giving people trouble.