> But you absolutely can't be all of them just because you know one of them.

But you can definitely pick up at least intermediate knowledge with enough ground space given. I agree don't interview to a CV job when you are a NLP, but given what most places actually do, i don't think it is such a hard barrier to expect someone to pick up what they need to do in 6 months. I am sure a CV engineer could pick up tokenization relatively quickly.