IMO, most people likely don't want to be experts because there is a point of diminishing returns after you've acquired a certain proficiency with a language.
An excellent well-wrapped point. Ground your skillset proficiencies based on the truth that software adapts and will always adapt.
That is one reason, there many and all good ones, I did not implied that they should strive to become an expert.
We should have experts to push the boundries further, but just a few is enough
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