In the spirit of some states now requiring salary ranges for job postings I think it would be good if HN followed that trend.
I often read the “Who is hiring?” posts but I have no idea if the jobs are even remotely within my range. I think it would save everybody a lot of time if a range was posted.
But most of the "Who is hiring" posts aren't job postings. They're literally answering the question "Who is hiring" and inviting a wide range of people to apply.
Requiring salary ranges would significantly elevate the amount of work that goes into answering the "Who is hiring" question and therefore would reduce the number of postings significantly.
The smallest companies and startups would be the most negatively impacted. Big companies could probably kick it over to HR and legal and have them spend a week drafting up a post that complies with all of the various requirements in different states, but the average poster in that thread isn't going to want to touch a salary requirement posting for something that isn't a specific job ad.