Why do you repeatedly do "scheduled maintenance" during a live event that you have known would be active in advance? It just makes absolutely no sense whatsoever.
English
-
It may be some data they can get while live events happen (due to higher volume of players) to make adjustments based on this data. It'd be redundant if improvements to things like Iron Banner were added after the event.
-
Because the only time they are actually working and in studio is when they do events people actually care about....
-
My guess is that some issues don't come to light until the event actually occurs so BETA testing it prior must have missed this particular issue. I know Bungie was working on this before but they definitely missed something pretty heavily.