A uniform policy appears perfectly fair: the same rule for everyone. Its consequences, however, are highly unequal. For one person, an on-site day means a twenty-minute commute. For another, it consumes a significant part of the day and forces the household to reorganize around it.
For one person, the workplace genuinely improves collective work: they meet the people they actually work with. For another, the day is spent on video calls in a shared space, and being on site adds nothing to what could have been done elsewhere.
For one person, coming in supports learning and entry into the role. For another, it disrupts an arrangement that has been stable for several years. The central principle of this case can be stated simply: the same rule does not mean the same effect.