Re: ghosting - this was the single biggest annoyance when I was hiring en masse.

The HR executives would ghost both potential hires and no hires, because they couldn't be bothered to keep track (or they didn't understand the nuances.)

Our successful hiring rate went up when we cut HR out of the hiring loop, contained them in salary fit and background checks. The hiring manager was responsible for keeping candidates informed.

We kept diaries to keep track of potential hires and periodically went through them before starting a new search, something which recruiting agencies would charge us to do, but never did.