In fact, the players seem to prefer snow games for the very reason the other players are not able to move quite as fast and if they are knocked down, they are cushioned by the blanket of snow. The fans also enjoy the games because there an an added element of unpredictability to them. Balls are more prone to come loose and turnovers play a larger role in determining the outcome of the game. Thus, the more disciplined team with a solid running game and good ball control will usually end up prevailing.
Also, are you aware of the fact that during snow games, when they go to commercial, the ground crews are out there sweeping excess snow off the field? So it is impossible for conditions to exist where players will be slogging through 2 feet of snow.
Which would have taken away a huge advantage the Eagles have in the game -- a very fast quarterback and receiver.
The Eagles have a chance to get a bye in the playoffs so I am not surprised Jeff Lurie had no problem moving the game to Tuesday.