My Samsung prevents me from uninstalling the Facebook app which came pre installed.
I don't care if Samsung prevents you from removing their camera app but facebook doesn't have anything to do with Samsung so I should at least be able to remove that.
It's a matter of understanding how apps work on Android (at least today). When apps come pre-installed ir can sometimes be part of the system partition, such as Facebook is your example. Apps on the system partition cannot be uninstall, but they can be disabled.
I believe Google has been working to make it so more apps are not in the system partition, but it can be up to each phone manufacturer on how a bundle apps.
You can _disable_ it though. It can't be completely removed because it's part of the somewhat-immutable firmware image. Annoying, but not nearly as bad as force-enabled.
I don't care if Samsung prevents you from removing their camera app but facebook doesn't have anything to do with Samsung so I should at least be able to remove that.