Problems with this approach During the creation, you can get anxious to write the screenplay. It may take a month to 6 months to log every detail of your story. The script may seem contrived or mechanical. Working this approach tends to turn out a plot-heavy story. It may seem like the characters are forced to do what the writer wants, due to being so restrictive during actual writing.
Character development suffers.
There may be a great plot, but the characters will most likely be one-dimensional. Using this approach Convert all your plot points into the first draft and in the second draft work on developing your characters. Do character biographies. Create backstory for them. Use each draft to focus on a particular element.