Such a 'market' would need to be regulated (or managed, or supported, pick whatever word you like) - it won't work as a free-for-all, and we don't have the resources to act as arbiter. That's the point I've been making in all those explanations I listed.

Basically it would need to be a product in its own right. That may well be valuable, there's probably a need for it, — in that sense I agree with you and the other commenters making similar points. But it's not something HN can be.

> not allowing for such comments is only protecting bad actors

It also protects good actors. There are bad and good actors on both the supply and demand side of these transactions. It's easy to forget that if one is personally identified only with one side or the other, but the hiring market is fraught these days.