Actually, by some metrics the USSR's hard sciences did pretty abysmally also. See Hyena's remarks in this subthread here.
What I have in mind is not how successful the hard sciences were in the U.S.S.R., but that the environment for them was qualitatively and fundamentally different from softer fields, in which there was little ground (except perhaps for occasional highly specialized and abstruse topics) where one could discuss things freely without running into the rigid constraints of state ideology. Even if the output of Soviet math or physics was comparably poor, their mathematicians and physicists still had the freedom to do the same rigorous and sound math and physics a...
SIAI benefactor and VC Peter Thiel has an excellent article at National Review about the stagnating progress of science and technology, which he attributes to poorly-grounded political opposition, widespread scientific illiteracy, and overspecialized, insular scientific fields. He warns that this stagnation will undermine the growth that past policies have relied on.
Noteworthy excerpts (bold added by me):
In relation to concerns expressed here about evaluating scientific field soundness:
Grave indictors:
HT: MarginalRevolution