@Serenata if the Marleyans will go down in history as one of the most powerful forces in the world and for good reason, Eldians was too dangerous for this world. If only they were completely wiped out there would be world peace, but that was impossible. They kept a leash on titan power for their own advantage because of how lacking they were without, once they lost their reliable source of power, it was downhill for them. We are unknown of the future at this point.
Also, those that don't like that Eren was defeated, really need to take it down a couple of notches. Eren was no longer Eren, he was Ymir's puppet, and he was as good as dead at this stage. He's not even the only main character in the series we were given early hints of his sudden shift of character for about a while, to me personally it felt like he really wanted to be stopped, we can't say for sure how much was left of Eren or was it Ymir this whole time.
I can't really say talk no Jutsu part is entirely left field, instead of finding value in life itself, find value in the things around it, even if it's not living, procreating. Appreciate the things you enjoyed while being alive, and those who were lost in a misfortunate circumstance may still have had a moment in their life where they had been happy... unless you plopped out the womb to be tortured for the rest of your life, that is.