[unoti]

Yeah, you do. You can't rely on your employer to continuously retrain you through your whole career. Show me an engineer with 10+ years of experience who refuses to ever learn anything away from work, and I'll show you somebody working on old tech.

[vonmoltke]

There is a difference between learning things away from work and having open-source projects.

Also, some people have enough flexibility to learn new languages, technologies, frameworks, and such within the context of their day jobs.