In an RPG you pick a class, and then a build. Software engineering used to have lots of classes, like web, backend and DevOps, each with its own stacks. The take here is that it's all converging into two classes, product engineer and system engineer, and the specialty you have now becomes your build.
From episode 3 of Off the Leash, daily dev's podcast for when the headline isn't enough. The full episode is on YouTube, Spotify and Apple Podcasts.