I think that software development moves in terms of tools, libraries and to a lesser extent, languages faster and more frequently than most professions. You're also largely expected to learn in your own time.

I've been at it since the mid 90s and the to spend 10-15 hours a week on my craft. From reading articles, looking at libraries to personal projects, it doesn't stop.

I don't expect everyone to do the same, but it does make a massive difference.