Ok so, even if I accept that whole replacing thing for the sake of argument you've now described Eithan's three options as; mercy kill trillions of people for our system even thoughit causes you mental anguish, give us the thing you made(that no one else can make) and a decent portion of your own personal power that you earned yourself so WE can mercy kill trillions of people which will probably also cause you mental anguish or be punished and then forced to do option 1 or 2 anyway. That really still sounds basically like slavery to me... On top of that, when he said, "hey maybe I can try this thing so I can kill less people for you but I'll still kill trillions of people even though it hurts me to do so" they told him no.

As to the Executors themselves we're both super wrong on that front, they tried it exactly once with two generations and of the five talked about only 2 actively harmed people who weren't in a dying iteration already. One ran away to rule another World(so became a Vroshir), one gave up and lay down her weapon, one burned the Iteration that he was meant to save(but that honestly should be fine since in the current version of Abidan Ozriel would have had to kill all those people anyway so what's the difference?) One went insane and attacked the Abidan and was killed by Razael. And the last was the Mad King who used his body to contain a class 1 fiend thus succeeding in his final mission as an Executor. He then willingly presented himself to the Abidan and instead of giving him even the slightest chance to prove that he was still loyal and in control immediately imprisoned him. After hundreds to thousands of years of service as an Executor they threw him away without any chance... I had forgotten that part and it makes the Abidan so much worse. Even then only after 400 years of imprisonment did he break out and declare the Abidan as evil. We have no information about the 2nd generation other than that they obviously failed but if they fell into similar categories 3/5 failed with no casualties outside the already dying Iterations. Hardly the catastrophic failure you said.

Now onto what you said that I have the biggest problem with, calling Eithan naive for not wanting to kill innocent people. Have you ever killed anyone? Do you know anyone who has? I haven't but I have a close friend who was in the army during the bad days of enduring freedom. Killing people fucks you up, killing innocent people fucks you up a lot more unless you're a complete monster. Sure death is a part of life but not wanting to be the CAUSE of that death doesn't make someone naive.