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Becoming a deep expert has too many diminishing returns IMHO.

Just look at Japan where it is often the goal to become a deep expert at your career. I once watched a documentary about creating buckwheat soba, and the guy making it said something along the lines of "I've been making buckwheat soba noodles for over 20 years, but I still have another 20 before I'm a true master"

That's great some people are willing to go for the gold in an extremely narrow field (like buckwheat soba), but I'd rather have silver or bronze in as many fields as possible than a single gold.

The wider the breadth of my knowledge, the more I can use one domain to solve a problem in another.