I gotta admit, through this thread i was wondering "What would Dreamstate think?" given i remember your activity in this space... and I'm genuinely surprised that's your stance (that's meant to sound positive, but the way)Personally I think all that there is to discover from the Guardians has already been found.
I think Frontier was going to get around to releasing more modules (so we'd have more than the Guardian Hybrid Power Plant and Distributor, we'd could earn a "set", so a ship filled with hybrid Engines, Armour, Sensors and the like), but this never happened because of issues inside or outside the company. Their resources were being spent on Fleet Carriers and the Oddessy expansion.
We got hybrid fighters, but the fact that they aren't immune to caustic, like any other AX fighter, means they are a worthless ship to use. Actually worthless.
I'm more along the personal conclusion that the Ruins and Structures littered in the Guardian Bubble tells of a story left to time, rather than it providing more clues to something else.
The Ruins are "Shrines". They are nothing more than a "chapter" in Guardian history, a marker, of the current events as to what was happening to their society during big changes, of which, there are three.
The Thargoid War. This spurred and changed the Guardian society massively. If it wasn't for the Thargoids, the Guardians wouldn't have over-developed their AI or relied solely on Constructs to wage war. This is represented by the most "rounded" Ancient Ruin or "Shrine" called ALPHA. It represents the story and history of the Thargoid War and all those who perished in it - it resembles Barnard's Loop and all the nearby Nebulas if you were to look in the direction of Barnard's Loop from the Guardian Bubble - if a little abstract here and there.
The second main event was the First Civil War - this was contained on their homeworld. This is represented by the "Beta" Ancient Ruin or Shrine. Again, it tells of a narrative. The main circular symbol that looks like a "key" is the Guardian's racial symbol - that of a "United Tribe".
The third main event was the Intergalactic Civil War - this raged throughout all Guardian space or outposts - this is represented, finally, by the Gamma Ancient Ruin - this tells of the "United Tribe" or "Traditionalists" at war with the "Progressive" faction. You will notice a new Guardian Symbol that is the smaller of the two.
Here's a picture to better show what I'm on about (attached).
EDIT: It shows the Traditionalists effectively believing they are being hunted down by the "Progressive" tribe or faction - or at least, this is how the Shrine itself is showing the conflict - which would make sense, because the Traditionalists were the ones to develop an early sense of spirituality or religion associated with their Shrine building. As with all things, a small amount of propaganda has made its way into their art; to show they are the ones that being victimised (despite being the potential purpatrators of the conflict).
That's an interesting take on things though, hadn't thought of the three sites as being representative of the phases of Guardian civilisation.