That is another hindsight remark by Macdonald. 20/20 hindsight by a subordinate is always an iffy proposition. I wonder what others might say of Macdonald disobeying orders not to cross the Katzbach in 1813? That was a court-martial offense.
Napoleon taking a calculated risk as a commander is perfectly acceptable and many times rear guards are sacrificed in critical situations in order to get the main body away. Being a commander at any level means that you have to be willing to make the hard decisions. If not, you have no business being the commander.