If by the time City come to Old Trafford, a win for them will put them above Liverpool, would you want them to win?There is likely a 1/millionth chance of our league position and Liverpool winning the league being tied up, so no need to speculate on outlandish things.
That’s a much smaller scale. Sacrificing one match here, and theoretically both teams could recover their objectives in later games, although of course there’s no guarantee.