[Knocks]

Well, you can only remove something if it was implemented at some point, which wasn't the case yet, IIRC. Not saying that it would not be an useful feature. But you also have to understand that Estuary also needs to be maintained. And therefore every feature has to be maintained as well. Estuary is meant to be a very basic skin with very basic functionality. Most likely all the other exciting features are done by other skilled skinners out there who either do their own mods of Estuary or who are creating all those fancy skins. If Estuary doesn't fit your needs, then feel free to pick something else which works better for you. For example Estuary Mod V2 should have that feature implemented, no? 

I'm using the official Google Play Store version of Kodi, which only has a handful of skins available for download.  I don't want to do too much hacking on a device that I mainly use for Android TV (it's the new Nvidia Shield btw), because it would be a shame if it stopped working.

As far whether this feature was removed, I believe that it was, because older versions of XBMC/Kodi allowed you to have Files in the main menu, and Estuary does not.  Since Estuary is the default skin now, for practical purposes the feature can be considered removed.