I really don't understand what you're trying to get at, are you concerned with out of date packages? The whole point of package repositories is to avoid that problem, although QA testing and policies can make that non-obvious to users who aren't running some sort of 'unstable' option.

Some projects (Chrome I think?) release packages that actually add their own repository to the user's system so that the user can receive updates through their standard package manager. Other projects (Firefox) have a built in "check for updates", but then you end up back in the decentralized Windows/OSX update hell. That option is generally disabled by distro packagers for obvious reasons.

I've seen a lot of people citing the lack of package repositories and package managers as a weakness of Windows/OS X but this is definitely the first time I've seen it the other way around.