Well, the problem is that the Soviets kept this accident hidden. According to the Wikipedia article, news of that incident did not reach the West until 1980, and it was not made public to Soviet readers until 1986…
Actually yeah. I kind of misinterpreted the OP to mean long-term lessons learned from the Soviet/Russian program.
Well, yes and no. Using pure oxygen in orbit at low pressure wasn’t the danger. It was using pure oxygen at 16 psi in tests on the ground (like Apollo 1) that was dangerous. But yes, NASA obviously knew this, but they had gotten complacent about it and let ‘go-fever’ take over (both the managers and the astronauts). Had we have heard (and seen photos) about the gory details of the Russian accident of a high pressure, pure oxygen fire inside a manned capsule it might have gone a long way to thinking twice about its safety.