Why are Kett and Angara languages translated so soon?

If I am not mistaken, here is the reasoning for each species explaining why we can communicate with them.

Angara: Keep in mind that the outpost on Kadara has been established for several months prior to the events of MEA. The Angara have already made contact with the people of Kadara. Their experiences with the newcomers weren't the best, which explains why the Angara government seems a bit cold when you first meet them. The reasoning goes that in the few months that Kadara was set up, individual angara and Milky Way species exchanged technology and culture, including language. As Milky Way species travelled around the Helius system, that information would get passed on/traded. It would make sense that the Angara already have that technology on their homeworld by then, hence explaining why we could understand them.

Kett: My reasoning is that the Kett have already come into contact with Milky Way species by abducting them for "study" (aka exaltation). I suppose it would make sense if after studying them for several months, that the high level members of the Kett hierarchy would understand how to communicate.

As for how Ryder can communicate with these species upon first meeting them, well there's SAM. Keep in mind he's able to decipher the console on Habitat 7 that's coded in a completely new language in a matter of minutes. It wouldn't be too much of a stretch to say that, after a few encounters, he is able to process their speech and make it understandable.

SAM MacGuffin, because that's his role.

And, after all ...

Back when this game came out I might have said 'Space Magic' and posted some gif or other, but as a collective group of Mass Effect fans I think we have larger issues to worry about right now.

Besides having a supercomputer that partly lives inside our head as well as regular translation software, the reasons are as said above the Angara had contact with the Exiles for several months and the Kett for nearly a century. So when we meet them, they are able to understand the languages and then through them we learn the languages of the Angara and Kett.

Because it's science fiction, and the "universal translator that can immediately make sense of any alien language" is a must.

....which pretty much describes SAM.

When SAM was able to immediately interface with the alien technology on Habitat 7, I got flashes of the movie "Independence Day" when the heroes are some how able to plug a regular human laptop into an alien computer system to send it a virus.

This. "It's a super powerful AI, therefore anything it does is acceptable in the game's setting," basically people are finding a shitty reason to excuse a shitty execution.

Yeah, SAM was one of my least favorite aspects of the game.

Ryder could literally wave his hand in the air and make things happen.

Ryder's the mobile SAM interface, so I don't see how we can do without him.

Note that the Angara did have plenty of contact with the exiles before they contacted the AI proper.

Suvi exist for the human element, Ryder exist to do all the dirty work.