I just think it might be useful for the team to recover from injuries - and have a bit of 'relaxation' with family - without worrying about what they eat and drink for ONE day.
Peterborough following Sunderland with 3 matches off due to covid.
Not sure how it works as some teams still played without players who had covid but others postponed. Peterborough have said only 1 player at the moment has it.