It’s been a few days and other people above have already put you through the ringer on this, but funny enough the 1960’s work style, of the soviets specifically, is ideal for rapidly advancing rocket tech. Or any tech, for that matter! They iterated and flight tested early and often. The soviets only lost the space race because they ran out of resources, as this is an expensive approach, but SpaceX is back-stopped by Elon + the US gov via contracts + they already have production flight revenue and wildly successful products.

I won’t be able to do the explanation much justice in a paragraph here but Google around about how the Soviet approach to rocketry was far superior than that of the US and you’ll uncover plenty on the topic. SpaceX is executing that same style of engineering development, marrying the ‘move fast and break things’ tech company ethos with aerospace engineering.

That’s why they’re so revolutionary: aero is typically riddled with red tape and risk aversion... they take the Silicon Valley approach of moving fast and breaking things, along with keeping as much engineering in-house as possible to cut down on expenditure, lead time, quality control etc. etc.

Source: used to work on SpaceX’s only commercial crew capsule competitor, Boeing’s Starliner, down at the Kennedy Space Center.