A guess and thats all this is! to alleviate the potential consequences of missing closing the crossfeeds.
But you get the TANK/ENG message because a crossfeed is open and the fuel is about even between 1 and 2 or 3 and 4. I was taught pumps first and then X-feed because if you did the x-feeds first the message would blank and you could forget to turn off the O/J pumps.