They were working with 1960s Soviet computing capabilities. They were working with 1960s material science. They were working with 1960s understanding of rocke

They were working with 1960s Soviet computing capabilities. They were working with 1960s material science. They were working with 1960s understanding of rocketry. Korolev died. We've come a long way in the last 50+ years, and sometimes you can use materials with substantially higher limits to paper over design risks.