A continual thorn in my side has been the way the per character timer lockouts work on the daily allotment of courier assignments: It requires so many extra hoops as far as planning out when you log in and do them each given day of a week, makes daily scheduling kind of a nightmare if you get thrown off a convenient window one day and have to move your whole schedule the next day, and just generally seems more complicated and unnecessary than just having them reset for everyone every day at midnight.
I presume this system was implemented for players that would be doing deliveries at the roll-over time everyday and getting less allotments as a result, but the current system really seems like it causes more issues than it solves.