I don't think the portrayal of Kitty in Oppenheimer in any way negatively affects the film (which I consider an outstanding piece of work). Another film from her perspective would be fascinating, I daresay, but this wasn't that film, and this film cannot be all things to all people. Her role was limited, yes, but that's because the focus was her husband.

More on my reasoning here: Why I Disregard Oppenheimer Whataboutism | Fanfare