Lift limitation of a single submenu in the navigation tree

It’s probably been asked a lot of times, but at the moment, you cannot do multiple nested submenus without a lot of dirty css tricks or navigation layout tricks. It would be much simpler to allow more nested submenus. Especially for more complex apps, a single submenu can become quite crowded and if you have to many main items, your topbar gets crowded.

Why can’t the restriction on a maximum of 2 nested items be lifted (or upped to max 4?)