That implies that the beacon was what was used to keep them ahead of the curve, which fails on two levels. First, there's other Prothean crap underneath the temple, and their data were stored in forms other than beacons, that could be read by those without the Cipher, like the Mars archives. Second, everyone based all of their mass effect technology on Prothean hand-me-downs, so the idea that the asari were staggering their advances periodically over time (which was only a conjecture and not stated as objective fact in-game) instead of just diving into it the instant they found it and building their entire society on it, before even meeting the salarians, makes little-to-no sense. Unless the Protheans wrote different examples of their technology using increasingly complex computing formats that it'd take steadily higher levels of technology to crack, which not only also makes no sense, but would require the asari to be technologically advancing on their own anyway.
Also, no one joins the fight immediately. And in the actual codex entry that relates the objective facts of the battle, Thessia isn't harmed particularly worse than anywhere except Palaven, thanks to its military not be quite so enormous. Certainly it's not hit worse than Earth.
Funny, as that certainly isn't the case with any other DLC in the series. Do you have Bioware's confirmation on that?
Was there any other technology on Thessia that was hidden away from the public besides the beacon? You're literally making up evidence to white knight the Asari. It's like North Korean levels of detachment from reality.
All of the Prothean tech you see is the same as the beacon. It's Occam's Razor to conclude that it's all the same rather than generate a story about how it's different just to paint the Asari in a more sympathetic light. Next, this is a game where the word of characters is law, especially since there's no alternative explanation provided by the game. You're trying to invent a reason and fly it past as canon, but it's not happening.
There's an easier explanation. The Asari (like the Humans) hadn't accessed all the information on the beacon, and once they realized they weren't alone on the galactic community, decided to use newly discovered information on the beacon to put the Asari on top and keep that system going. Every so often, when it looked like another race was making a development, the Asari would use it again to put themselves back on top. And, unlike humanity, who have only had 40 odd years to study the Mars beacon, the Asari have several millenia of experience with their beacon. They know a lot more than they're letting on, and it damn near damns the galaxy due to their selfishness and stupidity.
Seems like everyone is willing to join. Except the Asari. They are the only ones who boycott their war summit in favor of pretending they're too high and mighty and above the Reaper threat. I don't see anything in the codex relating information about Thessia after the invasion. Dialogue all points to a very different picture.
Yes. It's called the story DLC. It's all canon if you have it. And if you don't and choose to ignore it, that doesn't mean that the events surrounding it don't happen. Not recruiting Javik does not miraculously mean that everything he says about the Asari never existed.