If every application were signed (like on the apple store), does that help reduce the risk here? If it were a game server then all apps run would presumably be

If every application were signed (like on the apple store), does that help reduce the risk here? If it were a game server then all apps run would presumably be provided by some official third party who could be relied upon to sign the binary. If it were all signed, then is the risk of the box becoming compromised fairly small and worst case, replacing the entire box (rebuild) if there were an issue could address problems quickly? [edit to make it clear that this is a question]