Over the course of my career, probably 2/3rds of the roles I have had (as in my day to day work, not necessarily the title) just no longer exist, because people like me eliminated them. I personally was the last person that had a few of those jobs because I mostly automated them and got promoted and they didn't hire a replacement. It's not that they hired less people though, they just hired more people, paid them more money, and they focused on more valuable work.