The sad part is all the users who think that not providing the folks who own the physical instances of hardware the choice to install software from any location

The sad part is all the users who think that not providing the folks who own the physical instances of hardware the choice to install software from any location, is great for the end user. This option is present in Android. And you can use it at any time. Is it often that the option is used? Absolutely not, I've never even used it myself. But I still think it's great that it's available, and, if need be, I can easily install any app I want from any source, even if Google doesn't approve of such app or such source.