[CzechTech]

Pretty much every job? I'd say about 10%. With all the web and web-adjacent jobs around, maybe even less. Most stdlibs are already written in a sensible way, so calling "sort" usually means calling quicksort. Most people just do not care, they have tickets and bosses to worry about.

[nkozyra]

Absolutely. While every job will depend on sort, so many of them will have negligible benefit by changing the least efficient algorithm to the most.

And most of them just use a native language sort that does something relatively smart out of the box.

It's good to write all of these at don't point so you understand why things are inefficient.