They achieved the highest chamber pressure for a full flow staged combustion engine. . . . EVER.
They've flown and landed upper stage prototypes, achieved an engine production capacity that not even China or any state power in the WORLD has managed in the history of humanity and account for a significant portion of global payload to orbit right now.
They've developed an in house metal alloy that allows for temperatures in the turbine and combustion chamber to reach levels that the United States Government considered "Impossible" during the cold war and one so exotic that only like 4 engines have ever been built in all of human history. The only one of those engines to leave the test stand is . . .the Raptor.
They develop and build their own heat tiles and have achieved significant output capacity in the past two years.
The support system at the launch site which includes the launch tower, grappling arms, fuel stores etc are in very advanced stages at the moment and certainly ready to handle a steady stream of iterative full flight tests.
All this IN PARALLEL !! The weight of the booster through iterative design has been steadily coming down as well, the engine ISP and chamber pressure has been rising in insane steps to the point where it is already amongst the best rocket engines known. Complexity of the engine build has visibly come down in the past few months alone.
Each of these items by themselves take YEARS and were similarly expected to take YEARS even when Spacex started work on them. They're much further along than many people thought they would be two years ago.
There is a lot of juicy detail in the three part video that the Everyday Astronaut did with Elon Musk at Starbase, i'd urge the people interested in this thread to go watch that instead of the armchair idiocy of either the OP or myself and make up your own minds.