Debatable. Half-Life’s early development was a hot mess until they started building around how things actually worked. Like, they had the soldier AI, and it completely fell apart outside of some corridor-heavy environments… so they remade all the soldier encounters to take place in hallways and crate mazes.
The crouch jump was almost certainly an accidental invention. But its inclusion in the game was surely devs going ‘this is neat, let’s make it a whole thing.’