I used to work for a company that had some vacant roles and never filled them. The thing is we actually put out job postings and received tons of resumes and held interviews that I was a part of – We actually needed to fill these roles. But a week later the bosses would decide not to move forward and the position would stay empty. The hiring process and training was too much effort, apparently. Penny wise and pound foolish, I say.
I've also found out that a lot of positions I left were never backfilled even though I saw postings for these jobs online. Many positions I've applied for along the years were also never filled, even though HR said they desperately needed them filled when I interviewed with them.
I often wonder how many employers bitching about how no one wants to work, or companies/businesses with skeleton crews, could actually have more staff if the bosses weren't lazy and actually spent the time to fill the positions and nurture the new hires.
I know hiring and training takes time, but it should pay off in the long run. And no one wants to interview with a boss who seems like they're annoyed by your presence.