system
Given the following post, respond as if you're commenting on Reddit:
human
[Marvel] Why in the Marvel Universe does Earth not have intergalactic space flight capabilities?

Why with all this alien tech being destroyed on Earth, Tony Stark being a genius, etc. etc. is Earth limited in having advanced technology used only by certain people (avengers)? Even in the comics and such Marvel super heroes are always interacting with extra terrestrial beings and even beat them in some cases but why is Earth's technology so primitive in comparison to the Kree or Scrull or whatever aliens there are? 

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In the cinematic universe wakanda has technology to the extreme, even beyond something Stark can muster, so is FTL technology really that far out of their reach?
gpt
Well, for starters, it's probable that few if any of the neighbouring star empires have the technology for easy or reliable intergalactic travel. It's not something you need, when a single galaxy is as large as it is.

Earth does have the technology for interstellar travel, but it's prohibitively expensive. Earth is surrounded by the aforementioned empires, none of which have any need of anything Earth can offer, and most of which are scared of and antagonistic towards Earth, on account of all its superhumans and its history of punching above its weight in interstellar politics. This is why pretty much all of them voted to turn Earth into a maximum security prison a few years back.

Of course, Earth does have enough technology to defend itself, and various governments have come together to form SWORD, and then to re-orient Alpha Flight, as planetary defence forces. These organisations have their own spaceships, and can visit alien worlds as necessary, but since we have no trade with them, and diplomacy is limited to "Earthlings fuck off, we don't want you conquering or destroying *our* empire, thank you very much", there's very little reason to do so.