LCA: Addressing the failure of open source

Maybe I misled you. KDE or Plasma Active may have some hack value indeed, however, by citing KMyMoney, I wanted to focus on the "money" part only.
This is a useful personal finance application, for... *personal finance* (to me at least).
Maybe that's where the effort should go now: finance apps, office apps, administrative file management for... (whatever is useful for the general public), geographical apps, education, etc. There are several already, but nothing that can be as bullet proof (and varied) as for C programming, network file transfer, etc.
I am even sure these things could have some hack value if only engineers could figure easily on themselves what is truly useful.