The idea is that having exactly the same or similar algorithms to agents is enormously good, due to a proliferation of true PDs, and that therefore even non-game-theoretic parts of algorithms should be designed, whenever possible, to mimic other agents.

However applying this argument to utility functions seems a bit over-the-top. Considering that whether or not something is a PD depends on your utility function, altering the utility function to win at PDs should be counter-productive. If that makes sense, we need better decision theories.