It took me a while to grasp what they were saying, but I think I understand now. The best ideas are those which solve multiple problems at once, for they fix problems deep within, rather than the surface-level imperfections. This is better than solving problems one-by-one, or just throwing more resources at the problem, for those actions are just quick fixes that leave the underlying faults alone.
I know that's not exactly what they said, but that's the meaning I took from it.