SpaceX is making significant breakthroughs that you can appreciate if you understand the tech.
> As of 2019, only three full-flow staged combustion rocket engines had ever progressed sufficiently to be tested on test stands; the Soviet Energomash RD-270 project in the 1960s, the US government-funded Aerojet Rocketdyne Integrated powerhead demonstration project in the mid-2000s,[6] and SpaceX's flight capable Raptor engine first test-fired in February 2019.
https://en.wikipedia.org/wiki/Staged_combustion_cycle
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