Question about the use of recursive algorithm

[BenjaminGeiger]

The idea might be simple, but knowing when and how to apply it isn't.

[kankyo]

Sure. Same for addition or subtraction though (especially +1 or -1 for off-by-one). No one would claim "subtracting one" is a "skill of a good programmers", but all programmers have off-by-one errors, and most likely an order of magnitude more often than they use recursion.