"One prime example is the new Post Formats UI. Having discussed this at length with users, developers, UX designers, designers, and everyone in between I have been hard pressed to find anyone who needs or even wants this new feature. It seems to be a feature desired by core developers but not necessarily wanted by the people who actually use WordPress." (@Morten Rand-Hendriksen)

Totally agree. Sometimes I wonder what's the point of wordpress.org/extend/ideas/ if it's completely ignored by the core developers.