I strongly prefer weekly changes as it allows people to stray away from their computer for days at a time and I plan an early spring vacation out of the country.
I just went through a practice routine of setting up a league and this setting has to do with roster changes. Roster changes can be made daily and are effective the next day. In other words, I'm not thrilled. It IS daily and not weekly.
The only other time I played in KingsFans league was 2001 and we made changes weekly. I can understand the frustration of having a player injured on Mondays and no way to change him for a week but also some of us have a life away from the internet - might be difficult to believe. While daily is more "real," weekly changes cause no predictable disadvantage to anyone.
I'll be out of the country on a remote Philippines island with no internet for 2-3 weeks. Doing it weekly limits the competitive "hit" i will take by being gone.
(BTW, why can't I upload an animated avatar?) I'm not outside the size limits and I really need my eyes to function properly. I get an error message when trying to upload my animated version.)