In the play pygmalion, what insight is offered by changing the character of galatea from a statue to a working-class woman?

Shaw's writing shows a significant episode from his own adolescent life.
It is presented that the character of Pygmalion shows a lot of caring to the flower girl who was desperate for a higher state in life. This determines that Eliza has indeed grown fully into a woman with her own state of mind. The story then focuses on the individuality of Pygmalion's character transforming into a woman of her own being instead of just a flower girl.

For Apex, it would be Working-class people are often objectified just as artworks are.