>Like they introduce this idea/person "Eternity" and all of a
>sudden, after years of the MCU, we learn about this being who
>can grant any wish?

Not sure I get the issue here. Damn near every discovery can be reduced to "all of a sudden". Because things have to already exist, in order to be discovered. It's just peeling back another curtain, unveiling a bit more of this world, and it's inhabitants.

>Well why didn't Thanos use Eternity to
>wipe out half the universe?

Easy: He didn't know how to reach Eternity, but DID know how to obtain the Infinity gems. He went with the goal that seemed more readily obtainable.

Or he knew of Eternity, but thought it was a myth.

There are any number of plausible explanations.

>Why didn't the Avengers use
>Eternity to fix what Thanos did?

Most problems likely have more than one solution.

Why not ask this question of every solution one doesn't choose?

It's not much of a problem at all. And again, any number of possible reasons exist. But the movie actually answers this: they didn't understand that Thor could use the Bifrost to reach Eternity until Jane noticed some old drawings that showed this happening.

Just because a potential solution exists, does not mean that everyone automatically knows how to reach it.

It's nothing to believe that Thanos knew of Eternity, but simply wasn't entirely sure it existed, or how to get to it- but had much more sure knowledge of the existence of the Infinity stones, and a more realistic plan to obtain them.

Easy.

>>Why hasn't every villain to
>date been trying to track down Eternity?!?!

Why doesn't every thief steal crypto instead of whatever it is they stole?

Why doesn't everyone make the exact right decision at all times?

It stands to reason, exercise and healthy diet yield significant positive results, so why are junk food and streaming media multi-billion dollar industries?

The answer is simple: people, and life in general, are complex.

Do you think Vulture, Killmonger, Whiplash, Hydra, etc, *all* know Eternity exists?

OF those who do, is there any rational reason to assume most of them knew how to get there?

Everyone has their own agenda, and their own reasons. So even those who did know- and we have no reason to assume anyone knew enough to actually make it happen- likely craved something different.

>Like you introduce out of nowhere this MacGuffin problem

It's not out of nowhere though. It's just something we hadn't seen until now. A gazillion things exist in the comics, and it's a matter of time before a lot of them wind up in an MCU movie. They're not coming out of nowhere, just because we're only just now learning of them.

You could argue that Kang "came out of nowhere", because we didn't discover his existence until Loki. It's no different.

>solved by a MacGuffin solution and everything is the same at
>the end. It just seems like lazy story telling.

what's the MacFuffin though? The Necro Sword? Eternity itelf? Neither of these are unimportant. Stakes are definitely high here. Hell, those stakes are why Zeus wanted no part of the mission.

The light, silly nature of the film doesn't really change th weight of those stakes.

>And damn if its not another movie where the Power of Love
>saves the day.

That's what superhero movies are, damn near by definition.

The love one *hero* had for the other, as well as *humanity*, drove said heroes action. But it's not like love itself was some magical spell. It was still driven by actions- but most superhero movies are, to an extent, a series of actions driven by one person's love for someone or something.