[SDPhantom]

I haven't watched any of the streams. I just don't have the time or attention span really for that format of media. Even so, the way BackdropTemplate was coded, it seems like it's a bridge between the old backdrop layouts and the NineSlice system. I would venture a guess that they're in the middle of converting everything to NineSlice and the old Backdrop is going away permanently.

With how much older code used the Backdrop system, it would take substantial effort to convert all of it at once and it was easier to move the new implementation forward this way to buy more time.