Sometimes I wonder what would have happened if Chrysalis had just kept her mouth shut. Probably an ultimatum from Celestia: “Do you surrender, or not?”
They were within an inch of reforming themselves when the idiot on the right stomped on the very notion despite having seen the overwhelming power of friendship in her universe. First-hand. Multiple times.
While I am glad they didn’t get redeemed in the show. I will admit given time they COULD possibly Semi-reform. They pretty much had a friendship forming even if they wouldn’t admit it. Just look at the campfire scene with them talking about tricking Twilight and the other ponies, they were laughing and having a great time.
Maybe you Tirek with your father issues, but cozy? nah, your nature as an evil pony is what you are, is not you cant learn is what you choose to be again and again. and you chrysalis? just as cozy, its your nature. unlike your subjects (then again they just change a crown for another,still they choose)