This is a framing issue. You can't control the times, but good advice is applicable in good and bad times. If Hamming was operating from a "good time", it should be true that his policies are also applicable in the "bad times".
His advice to "work on the worlds hardest problems" was spoken to people who had worked their way past the initial difficulties. General advice to "Move towards important problems", which is precisely the same thing, applies in good and bad times, and is very likely to produce in you a valuable expertise.
His advice to "work on the worlds hardest problems" was spoken to people who had worked their way past the initial difficulties. General advice to "Move towards important problems", which is precisely the same thing, applies in good and bad times, and is very likely to produce in you a valuable expertise.