Yep, I hope this sort of stuff is explored too. It would be pretty interesting if we spent the whole game building colonies with a sense of triumphlalism only to have it thrown back in our faces at the end of the game that this is basically imperialism.
Though, from the story synopsis it feels like the Helius Cluster was occupied by the Remnant in large numbers, but they mostly disappeared, and now both humans and Khet are coming in as outsiders to try to claim this region. Sort of like a terra nullius situation, except some of the original inhabitants have remained behind to guard their lost treasures.
One of my favourite parts of ME3 was the conversations with batarians on the Citadel and the way BW tried to humanise them a bit, especially after Shepard straight-up murdered like 300,000 of them.
(Damnit, Arrival.)
Totally agree with you on the Batarians. Up until the last game they were by and large the 'racist jerk-hole' race. BioWare giving them some much needed screen time, a chance to tell their side of things and a nice conclusion to Balek's character arc where much appriciated.
The depiction of the Batarians offer a nice parallel into how the narrative was largely biased in humanity's favor that I hope to see ME:Next avoid.
Yes the Batarian government was corrupt and idiotic, and yes characters like Balek did some pretty horrific things, but in looking back to how their Cold War with humanity started it was a rather ambiguous situation.
Here you have a developing interstellar civilization and suddenly this alien race shows up and starts colonizing all of their intended worlds. Naturally the Baterians go: "WTH!" to the Council but they tell them to "Deal with it." So far a nice, ambiguous dilemma.
But then the narrative has the Batarians get all whiny and start descretly attacking the alliance "For no reason whatsoever". Even though humanity was almost Krogan-like in their expansion the Batarians are painted as the bad guys for being concerned about their interests. In fact, that one planet (name escapes me atm) that the Batarians said was rich in resources and then was imeditatly swarmed with human mining companies showed how aggressively the Alliance was in their expansion.