Oh, you wouldn't want to be able to split up black holes, since that means they could be destroyed during warfare.
Depending on what the cosmological constant is, massive black holes could be quite useful in the far future. 10^100 years from now, long after all the stars have gone out, it could be the case that the only life in the universe would be huddled up against the event horizon of supermassive black holes, exploiting the tiny temperature difference between the pseudosurface and the void to generate a trickle of power.
Splitting black holes would rob the far future of that power source to be used now. You could do it, but why shorten the useful life of the universe?
Depending on what the cosmological constant is, massive black holes could be quite useful in the far future. 10^100 years from now, long after all the stars have gone out, it could be the case that the only life in the universe would be huddled up against the event horizon of supermassive black holes, exploiting the tiny temperature difference between the pseudosurface and the void to generate a trickle of power.
Splitting black holes would rob the far future of that power source to be used now. You could do it, but why shorten the useful life of the universe?