Time for unpopular opinion.
I support Entrati. Yes, you feel me - I made a great work and avoided all 'yesbroheisbad' choices in dialogues with Hex and etc. I can't support my friends when they tell me things like 'booo, Luvoid, he could do better, he ruined too much, he is baaad, boooooo'.
Hold on. Here are we, Destined Tenno, a Great Mystery Drifter, Cool irl Player, ok. Here is Entrati - a science person, who made The Worst Possible Mistake that Noone Could Ever predict, who faced The Worst Evil - for a long time alone, solo, face to face, and Entrati did his best to keep Origin safe from The Devil.
Later he had to erase his existence and say bye to his family, friends, his life. He could not trust nearly everyone even himself.
He created The Plan how to kick Indifference's butt outta here and he already expected US to show up one day but we were never promised so he could not count on us.
And then he left with keeping precious Loid as safe as possible and as guarantee that at least someone will be still here to continue, to tell truth, to lead the fight, if Entrati fail - the more ppl knows, the more would be in a literal danger, cuz Indifference react when you are attentive to it, you become a flaw, a door.
When we catch up with Entrati, he already made his decision to sacrifice 1999. He didn't know we will show up. We changed situation, we helped Entrati in the way he will never goal alone without us. He had to destroy one world to save eternity of others. He did a hella of hard work with all that cooking with infestation plus gaining trust of ppl plus calculating events. He needed that energy. Remember, one world in exchange for eternal pool of them. You can't eat a pie and still have it, yeah?
So, look, eternalism is amazing yet none of the worlds are magic golden key with the fairytail solution for winning against Indifference. Every world is real world and real world isn't sweet and rainbow and not even fair mostly as you expect it to be from your point of view.
You may still say that Entrati is bad. Ofc. I'm here to explain my opinion, not to change yours. But I say - my homie Albrecht doing his job and he's doing it so damn good. Origin still exist and Indifference didn't nullify everything. My praises for this lonely man.
And ofc he can do mistakes. Maybe erasing 1999 could be that mistake, maybe he already did 9999 of such a mistakes and only now he found out right sequence for actions that we ruined. Still - any better ideas? I doubt you could find any if you try his shoes. Help him, don't blame him. We already could lose him as we lost Rell and with this loss we could have no hope at all. That the only thing I know for real.