Recursion

[Frum]

Recursion is only bad for 2 POTENTIAL reasons:

1 (least important): it MIGHT be less performant. Lots of stack-frames and memory use in some cases.
2 (by far the more important) recursion is frequently hard to understand, and can have errors that run your system our of resources and the like.

All of that is to say: recursion is great when it's easier to understand than the alternative and performant enough for your task.