What happened to MenuItems in SHell?

I have been using the last few previews of Forms 4 and had a nice Flyout section with selectable items created from a database followed by MenuItems for things such as settings, About etc.
The release version has broken this with the removal of MenuItems.
WHY was this done? MenuItems provides flexibility when I do not want to have tab items, where I want a modal page or where I want a conditional page (I choose in a bound command).