Just a thought and not sure if it is something that may change, but wondering if you are going to update the UI when it comes to the fields within a page/post/etc?
I use both ACF and MB and have to say that the one thing I do not like about MB is their UI when it comes to pages, posts, custom post types, etc. This is what the client or user sees and it is ugly and unfinished.
Any thoughts on maybe updating that area? You have such fantastic options/features throughout MB AIO, just seems this maybe got forgotten about.