Most likely that. Assuming they want to find a way to prevent the boot manager from getting borked on updates for both sides of the fence. If they roll it out half-baked they’ll probably get flooded with tech tickets which would eat bandwidth for other issues. Basically preventing them from getting dragged down the support rabbit hole. In current state, if you muck up your install it’s on you to fix/troubleshoot.

For those that are more familiar with this process like you and me, it’s not a real hassle. But when you push out a new “feature”, they have to resolve for the lowest common denominator, which would consist of the more “casual” users. Bearing that in mind, you can probably see why they want to flesh it out a bit more.