That is not true, based on my experience. I started to learn and use kubernetes about a year ago (now we are running our production systems on kubernetes) and we are usually on the latest version. I cannot mention anything which I learned about kubernetes and because useless, because something changed.

It's less true now, but a lot of older blog posts and books (at the time, even the most recently published books) talked about managing via replica sets instead of deployments. That was a major source of confusion for me when I was getting started.