[SPOILERS!!!] Mass Effect Andromeda PS4 Trophies revealed

Possibly the meridian is the device (remnant machine maybe?) that gets rid of the energy cloud and makes habitat 7 livable.

They call habitat 7 new earth so "home" would make sense.

They could sell it like a featured expansion (albeit still not exactly as expansive as a boxed expansion pack).

-Major story section (bigger than it would have been otherwise)
-Quarians get a bigger role than we know they would have gotten otherwise (perhaps even bigger than Krogan in base game?)
-Quarian male squadmate? (not Engineer?)
-Added aspects to rest of the game; blueprints, upgrades to nexus and its advancement lines, abilities, gear
-More gameplay than any previous DLC except maybe Citadel

I'd pay $15 for that. Which probably means they'll sell it for $20. Dammit.

Jaal and the Kett are tied to a lot of things, so it's hard to say.

Like what?

Jaal is a rebel, and the Roekaar faction appears to include Angaran, concepts fit together. I would not be surprised if Jaal was Roekaar and they were rebels to the Kett but Jaal throws in his faith in the Initiative, but that's more of a guess.

Kett is the central antagonist faction and has our main antagonist (at least as far as we'll allowed to know).

The other supposed loyalty missions do not tie into this main plot thrust. Vetra sister. A Krogan ship. A Remnant vault maybe, but as we can see, that's more about a personal rivalry. 

I think its much more likely that saving Angaran people from the Kett in enough of a way for an achievement, is not something Bioware will relegate to a totally optional mission. But another lesser-important faction with Angaran included? That's like the perfect loyalty mission material.

What I'll grant you is that some other things might make this more vague. Asari ark could indeed be either a Cora loyalty mission or a main plot mission; since its a damn ark. Uniting colonists could be anything from a side objective, to a loyalty mission, to an aspect of the main plot. So I'm not writing off your post.

Not exactly, or necessarily.

The Initiative, while started by Humanity and put into a position in this plot that seems to emphasis the Humans more than the others, is still more of a shared story than any previous Mass Effect. Humanity's achievements this time seem much more shared from the onset.

And there's the chance for stuff like future DLC that puts a lot of 'Human' off any sort of perch.

I mean, I can see what you say being the basic understanding at the end of MEA. But at the same time, its not a dominating power and there's opportunity for the writers to tone that down or even flip the script when it comes to Humans.

They can have a gist that casual gamers or observers can think is happening, while adding caveats all over the place.

If the Turian/Quarian Ark turns to be DLC content then I really want them to do it properly. Forget the DLCs and do a legit expansion with connected storyline+sidequests, explorable planet\s (with hub\s) and a quarian squadmate + weapons/armors blueprints. I'd pay 25-30$ for a quality expansion (not DLC).