If someone was that interested in coding wouldn't they just move on to another engine?
Its really hard to tell that to a customer that just paid for a license, because a selling point was "no code".
Then telling them to just go buy a plug third party plug that can't be guaranteed is another lead balloon.
Developers don't need poorly implemented leaderboards api's, or dodgey ad networks, they need access to collision polygons, image points, the inner workings of Canvas and Webgl.