Concepts, like individuals, have their histories and are just as incapable of withstanding the ravages of time as are individuals. But in and through all this they retain a kind of homesickness for the scenes of their childhood.
There are plenty of genre-crossover books, films, and games out there, but to do the job well, you have to do more than just smoosh a couple of 'in' concepts together, and hey presto, instant millions.
A great amount has been talked and written about what constitutes a sufficient balance and what really is meant by the concepts of 'balance' and 'deterrence'.
When you're writing stuff that's already clotted with neologisms and trying to get across fairly abstruse concepts, you're already putting a heavy burden on the reader.