[PeterisP]

Being generalist is a good thing in the sense that is good to have many skills at a reasonable level. Unless you're truly exceptional, it simply doesn't happen without lots of experience. At 20 years of experience, you can have e.g. 5 "secondary" skills (in addition to whatever key specialization you might have) where you have a reasonable knowledge and "exposure" from having applied them multiple times.

At 3 years of work experience, most people have just started to understand 1-2 things. It may be that you have gotten a great, wide experience at a young age, because you started to do hard things really early - if a junior person claims that they "know" many diverse skills, maybe they truly are a generalist, but it is so much more likely that this simply shows a so big gap in knowledge/understanding that they don't even understand how little they know about all these 'secondary' skills.

This is true at least personally - there are certain skills where 15 years ago I believed that I had them, however now I know that I don't and never did so, simply because now I have seen people who actually do have that skill and can evaluate my knowledge in appropriate context.