[wongarsu]

Neither did Ariane 5, Atlas V, Delta IV or Soyuz-FG. Of course SpaceX profits from the state of the art, but not developing the Xth iteration over a proven and battle-tested design with decades of flight-data is a disadvantage for SpaceX.

[greglindahl]

SpaceX benefits from being able to inspect landed boosters. This comparison is apples-to-oranges.