Wouldn't this create a convoluted messages screen if there's BR/Creative/STW all in one? I know it already sort of does this now for specific things like when Survive The Horde came out, but having so many at once would be weird to manage, unless it will filter it out if STW is selected (Which this used to do for Creative)
I cant really get into specifics on how the message of the day system works but i dont really think this should be an issue. If it does seem to become one or if I see folks not getting the right news or anything weird, ill be sure to bring it up to the team that manages this system and see what adjustments can be made.