One issue is the religious aspects. For example Abrahamic religions base their whole calendar on the unending 7 day week. Having a non-weekday smudged in is ver

One issue is the religious aspects. For example Abrahamic religions base their whole calendar on the unending 7 day week. Having a non-weekday smudged in is very sacrilegious to may adherents. It's surprising, in a way, but time is very much a political and religious thing.