Not everyone does OMAD every single day, especially when they have things happening with their family, or other activities that make OMAD difficult on weekends, or other specific times.
I have seen people say that they do OMAD during the week, and then on the weekend they do 16:8, or something similar, so that it fits in with their schedule better.
I have done this sometimes, and I think that as long as we are being as close as we can to the OMAD lifestyle, then we are still helping ourself , and not hurting ourself.
If it is a planned change, then it is not the same thing as “falling off the wagon” which is a totally unplanned binge-eating, which means a total loss of control over our eating.