Oh I absolutely get that the writers wanted to preach a sermon about revenge. My argument is that their method for that sermon derailed it to the point that it was entirely worthless. Overshadowing the narrative's message is Abby and the fanbase hatred for her and what happened to Joel. That's always going to be this game's legacy. Whenever this game is mentioned most people will think of that before they even think ya know that was a pointed message about the ills of seeking revenge.Because the entire thematic narrative of the game was the cyclical nature of blind revenge and how it accomplishes absolutely nothing. That having empathy in trying times is where humanity shines.
Joel went out of his way to kill people, for fear that they might hurt Ellie, and unknowingly signed his death warrant. His actions pretty much created “Terminator Abby”.
This isn’t a game about player choice and player agency. Abby choosing not to kill Ellie or Dina, after Ellie murdered her friends (Including a pregnant woman) is Abby showing growth and empathy for Ellie despite her hatred for her. She knows how easy it is to be motivated solely by revenge and she knows it does absolutely nothing to stop the hurt.
Having Abby kill Ellie defeats the entire narrative purpose of the game and ruins her whole arc.
Same with Ellie. Her insistence on finding and killing Abby had less to do with her hatred of Abby but due to her inability to forgive herself because she wasn’t able to truly reconcile with Joel’s choices before she lost him. Her killing Abby does nothing for her character or makes her grow in anyway.
If that was going to be the case why not seek to entertain the fans more than preach to them and preserve narratives, arcs, and messages they aren't even interested in hearing anymore?