Growing complexity makes your stack more specialized over time. You may be considered a jack of all trades at some point, retain and improve your skills, and be

Growing complexity makes your stack more specialized over time. You may be considered a jack of all trades at some point, retain and improve your skills, and be considered a specialist a few years later because there are a gazillion more technologies around. A good example may be server side rendering, something that used to be as simple as making a thin HTTP wrapper spit out some HTML, and now requires several specialists to agree on an implementation at many places.