Senior Concept Artist at @SES_dev, working on @Astroneergame | Prev: Valve, Runic Games, Riot Games, Toys for Bob, Microsoft, NASA 
|http://artstation.com/ness
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Like, I agree in terms of the production process that concept art is the early work to build assets off of, but not all Illustration work is just the 'pretty' and time-intensive stuff. I think they definitely cross paths often.
Oh yeah, thats why its such a complex/nuanced issue. There are different kinds of concept art, and they all serve to get "buy in" for the final product. The biggest issue is that an entire genre of concept art exists that is not largely considered illustration and vice versa
