By "doing something for 10 years", I think the implication is you're actively working on that subject area, regularly, for 10 years. Not per se occasionally wor

By "doing something for 10 years", I think the implication is you're actively working on that subject area, regularly, for 10 years. Not per se occasionally working on something every now and then. You can become a really good Chess player if you consistently play for 10 years--you figure out all the strategies and shortcuts, and it would be unusual if you weren't really good compared to someone playing for a year (assuming they're not some exceptional learner). But if your metric is just "I've played it occasionally since 10 years ago" then indeed, you probably didn't develop much breadth or scope as you were constantly forgetting and relearning as opposed to compounding your knowledge. As for programming, I don't think programming is all that hopelessly complex and broad as field, but it can seem that way to a beginner. Most computer science concepts translate very well to other parts of the field, and the core programming constructs and libraries don't change much at all. How many ways can you configure a website, a mobile app or a database? Your instinct might be to think about all the different libs you can pull in, all the different programming languages, etc. But they all do roughly the same thing, they all compile down to the same stuff. You just have to develop the skill of understanding the fundamentals as opposed to getting lost in a sea of high level abstractions.