Just like with human languages -- learning other languages just about only benefits you. Even 30 minutes of trying a new language can be beneficial -- you don't have to be an expert or become one.
Do you think in this day and age absolute expertise in one language or stack
I don't think it's possible or even if were that it would be useful. Going deep into something, sure, striving to learn as much as you can, absolutely -- but I think that as soon as You Know It All, you've failed.
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Neither.
Just like with human languages -- learning other languages just about only benefits you. Even 30 minutes of trying a new language can be beneficial -- you don't have to be an expert or become one.
I don't think it's possible or even if were that it would be useful. Going deep into something, sure, striving to learn as much as you can, absolutely -- but I think that as soon as You Know It All, you've failed.