From Eugene O'Neill I have only been able to read and see represented - many years ago - his work Long Journey from Day to Night, a title that in itself is a poem. Reading your review of A Electra's mourning suits him, I can notice the author's use of autobiographical elements. Expressed in a special way in the family drama (in the case of the play you're commenting on, the drama comes from the tragedy). Now, that tragic sense seems to be a feeling and concept that 0'Neill places in the conditions of the individual, who, if not signalled by the truth, makes decisions about his personal destiny. It could be said that the Erinias inhabit the psyche and disturbed heart of the characters, and their task is replaced by their will.
I thank you for your very thorough work, @honeydue, which I have read with great interest. Greetings.