I think the purpose is to get people playing daily or near enough. The purpose behind that is for the community. If you encourage many people to play most days then there is always an active community (such as it is). Without such encouragements fewer people would log on during the week or for shorter periods of time. This is just one of those 'log on daily' items. There's supply and provisioning turn ins, roulettes, beast tribe quests.

It would certainly be convenient for me (and everyone) if they changed it, but I don't imagine that they will.