Lame portrayal of Sharon Tate

My take on Quentin is that he's reached that Delta between peak success and realizing where he came from. OUATiH has all the pop culture references and personalized Tarantinoisms we've come to expect and appreciate but as you say he's starting to believe his own bullshit. Some say that Orson Welles went down the same path when he couldn't adjust his film making style to fit the studio budget constraints so he built up this image of himself as a suffering auteur film maker of high regard and exiled himself to Western Europe. But the difference here is that QT found financial success with his self-indulgent style whereas Orson didn't, but both were self-insistent about their vision of story telling that they remain unshook from any detraction or criticism. You're right to point out that Sharon Tate and Bruce Lee were inaccurate portrayals because they're both figments of QT's imagination, not a reflection of the world's interpretation. He just doesn't come out and admit that.