Because if you had read it you should have understood that in fact we start all services at the same time, in one big transaction. So if you try to argue against systemd by saying things like "Most of users _need_ NetworkManager to be started as soon as possible" then it is clear that you have not understood who systemd works: because in fact we start nm much earlier than Upstart or SysV: we start it right at the same time as we also start Syslog and D-Bus.