Full flow staged combustion cycle is many times more complicated than the open gas generator cycle of the F1. Its not just the fuel - the space shuttle used an ox rich staged combustion engine in the RS25 and that is one of the most reliable engines ever flown (hydrolox). Overly complicated for the purpose of efficiency. But spacex has mastered both cycles (merlin is a gas gen cycle). The Starship is the next generation. Not just next gen of falcon 9, but next gen of any rocket propelled spaceship ever produced to date. Yes its an apples to oranges comparison, but I reiterate for those who think that the Starship is "inefficient" or uses the "wrong propellants" or "has too few stages"

Once perfected it will decrease the cost of tonnage to orbit by 99% and that is f#cking incredible.