Did you use this library on the advent of code 2024? I'd never heard of topological sorting prior to that problem - and it was real early in the game.

Topological sorting is just "depth first traversal" in a trench coat. I have implemented it thrice in my day job.

It is actually more commonly implemented than any other algorithm in CS course

I didn’t take part in advent code. Topological sorting is a really old algorithm. Anything dealing with dependence would need it, like makefile.