All well and good, but "standards", the "great American songbook", whatever you want to call it, for whatever virtues were there, didn't reflect the blues heritage - I'm speaking about the blues of the black population, not forms or keys - or the white rural country heritage. It reflected a certain portion of the American population (and probably people who wanted to be part of those folks), and perhaps reflected the way that portion of the population spoke.
And to base one's judgement of the realism of a song on how the lyrics conform to "everyday" speech - and I won't bring up the matter of whose speech - is pretty limiting.
It's interesting that once black and rural white performers and songwriters became more ubiquitous on radio, how quickly things changed. A large audience wanted to hear something that reflected their reality.