Your point seems valid, but the message of Plato is clear regarding not only poetry but also art.
Considering your point of Plato’s thought about poets and artists, think of what world would be without the art.
Without Art, william shakespeare would be a waste, Hollywood means nothing, no craze and charm of buying new electronic and IT products among people. So world would far more different then what it is today. I would rather say that Art is everywhere today.
However, I kind of agree that western philosophers are reproducing other ideas of him.** But I also think that there has always been a communication gap between philosophers and their audience or common people**.