Could I kindly ask why the MBP set was broken up?

[Xitax]

Is there an advantage I can't see? From my perspective it's just a PIA. I have to go through all the decks that have that set designation and update them.

[Xitax]

To whomever quietly added back the MBP set file - my thanks. I may not be the only one who has a lot of old decks that use it.