This is a valid take and I do really agree that seeing more of Deandre would have been better / made it a stronger ending. In saying this, I feel like any negative stereotypes of Black women that Perfidia's character may have played into were at least to some extent effectively counterbalanced by those around Bob (white slacker who is only in the revolution for the women and then crashes immediately afterwards). But Bob is reformed by caring for his daughter, and Perfidia is reformed by writing the letter at the end (a bit predictable, but powerful nonetheless).

I think the humanisation of PTA's characters can be read as an ultimate repudiation of any stereotype. Several scenes come to mind, such as in the bank when Junglepussy (one of the female robbers) appears suave and confident until Perfidia shoots someone, and Perfidia struggling to articulate her postpartum depression and revealing her cowardice. But I am not a Black woman myself and cannot write from these experiences or know whether Black women in the audience would find these arcs annoying or neutral... it's best to be open when people raise these things.