I've had colleagues with surprising blind spots as well, even at Google. Sometimes I've wondered "how was this person hired here and they don't know X" (e.g. ho

I've had colleagues with surprising blind spots as well, even at Google. Sometimes I've wondered "how was this person hired here and they don't know X" (e.g. how to use the command line, what a CPU architecture is, etc...). But then those people have ramped up and done excellent work.