That report isn't quite accurate; you can install updates automatically on the device I have (I don't know if there was some point in time where that wasn't possible; seems like a basic feature). Some require reboots though, which is why by default updates aren't automatic. Who sets their servers on fully automatic updates (and reboots) anyway? I mean, even forgetting about the reboots - you don't want fileservers to disconnect all clients at any random point in time because it has to install some update to the service software.