What is this movie trying to say?

Rating: 7/10 (6 September 2019)

After seeing the high rating of this movie and reading that it is based on a true story but with a positive ending I got very excited to watch it. Even the TITLE of the movie draws you in. The movie is very well shot and has nice sceneries. But I was very confused regarding what this movie was about..
it was sooo slooooowww and nothing was happening until the last 20 minutes...
Some of the characters were so dull that they didn't exactly add anything to this movie besides runtime. I mean, what exactly was the point of including characters such as Sharon Tate and Polanski? How exactly did they enhance the story? If you completely omit them then this movie is just about the same without them. Why did we have to follow Sharon Tate from the airport all the way home and watch her walking in the street and watching a movie and dancing in her room and going to a restaurant and all that? Honestly, I ADMIRE MARGOT ROBBIE; if not for her, then I would've been bored watching the character she played, but doesn't change the fact that this character was completely useless since she wasn't killed/approached/touched/hurt as in the real story behind this movie. She (and Polanski) didn't even interact with the main characters until the very end of the movie.
I did indeed enjoy watching Leonardo DiCaprio and Brad Pitt! Their acting is brilliant and the characters they played are well-constructed and developed.
I can't submit this review without mentioning the amazing Julia Butters!!! Such a talented, young actress!!!! Her character (Trudi) is probably my favorite in this movie!