[kelnos]

You cannot install just any version of any application on your system, but a lot of people want that.

My thesis is that no, a lot of people don't want that. Who are we talking about here? The "self compile from source tarball" crowd grows smaller and smaller. The kind of user that is going to want a pre-installed OS image or the like does not in general care about updates to the software they have running.

Most people just install and forget, and if it weren't for in-app auto-update, most people would never upgrade.