The uncovered graveyard is a good thing to look at when looking at valve. Everything found in the dota wiki for incomplete items is shit that was explored at some point, or being designed. But then was simply scrapped and forgotten to be removed from patches simply because people weren't assed to finish it or forgot it.

The big issue with valve and features is they have good intentions, but often times everything they implement is left to rot and break internally after a month or so.

Remember the report system? Still really doesn't work. Either get super unlucky and get sent to LP or have to intentionally grief many games in a row to get sufficient "report history" to be sent to LP