I mean, he's Dan Abramov, the author of Redux! He's gotta know everything man! He's like the Pelé of React!
But seriously, some people forget we're all human and the software development world is too big for anyone to know everything at once.
Perhaps the only thing more frightening than not knowing "everything" is when you discover that even the wizards don't know "everything". What's a common response to fear? Attacking the things that cause (or escalate your sense of) it.
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