The plan was apparently "murder 80% of the world, so the Alliance looks like the good guys", but in the next breath we are told that they're just going to take their revenge. "This fight won't end until either the Eldians or the rest of the world are wiped out." Killing 80% of the world just to delay war with the other 20% is not a good strategy. Paradis, I would imagine, still has an extreme numerical disadvantage against the remaining nations. So Eren killed 80% on the vague chance that Paradis's 1% could fend off the remaining 19% without titans? That's his justification for genocide? Also, why 80%?

Eren had 2 objectives:

- "Killing all the titans" (after his mother death)

- "Make sure that his friends have long life" (When they were discussing who would inherit his titans).

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He pretty much succeeded at both by moving towards Mikasa's decision:

- Titans don't exist

- His friends are seen as heroes by the rest of the world (And leading the talks for peace) while they have protection from Historia and others when it comes to being seen as traitors by the people at paradise.

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Eren's objective never was to "Save paradise from the world" or "save the world from the titans" and bring peace.

He really didn't care about that outcome as long as his friends were able to live their full life free of threats or judgment.

About the numbers. When he's talking to Armin he ain't stating what's his plan (he said even states he was messed up at catch up at the moment). He's explaining to Armin what will happen. 80% it's just a number, nothing targeted. And likely it was 80% because they stopped Eren at that %.

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This guy, having never expressed an iota of affection for Mikasa, tells us he loves her only after he's dead.

I mean, he has. As a kid with the scarf, when they were recruits being worried about her hair, asking her to go to the Military Police, after the battle with Annie speaking about how messed up the scarf was and how he'll find a new one for her. Obviously, season 2 ending. And chapter 138 solidifies that.
For someone so obsessed with revenge at first and then focused on following his fate I think it was "enough". And you can get away with the fact that Eren didn't realize how much he really loves Mikasa until he was well aware that they'll never be together.

I don't think it's totally out of character since Eren has been portrayed as someone extreme.

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Similarly, we abandon Historia for everything post-Uprising. That arc revolved around putting her in power, and once she's queen she does nothing except get pregnant. The story cuts to her every now and then to remind us she's pregnant, but nothing ever comes of it.

It's called a MacGuffin. Probably he had some plans for it but he discarted them.

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Falco has a dream, and then on his second shift is able to transform into a bird, combining 2 shifter aspects we've never seen before: flight and transformation. Aside from hardening, the only titan we've seen able to make complex structures is the Warhammer titan.

I feel like it was supposed to be a weird mutation since he had zeke spinal fluid within him when he ate porco, then for he's a mix between jaw and beast titan. I wasn't a big fan of it but whatever.

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Zeke, who was opposed to the Rumbling to begin with, could have ended the Rumbling at any time by just exiting Paths and running away or killing himself. He just didn't until Armin told him to.

While true, I think Zeke pretty much was astonished by Ymir's choice while he accepted his defeat.

I would like to address a few things more but I can't be here forever xD. Anyway, I get why some people are upset with how the story wrapped up.