The caeliar are a mary sue.
In order to use the caeliar effectively, one has to 'devolve' them - either societally or technologically:
Mary Sue? Whatever you may think of the Caeliar they are very clearly not
Mary Sues. As Destiny illustrated clear flaws with their society notably their xenophobia, their apathy, and their lack of care of what comes of other intelligent beings.
But even then, my point is that the Caeliar have stories to be told, and they DO exists without needing to devolve them. That specific example was to illustrate that yes stories can be told by "devolving" them if a writer decided to do that, but that is not the
only way to tell a good story about them. Not to mention that the Caeliar are far from perfect to begin with as they contain the flaws I mentioned above
All of these flaws ("their xenophobia, their apathy, and their lack of care of what comes of other intelligent beings", etc) being unequivocally gone from the caeliar society at the end of 'Destiny'.
That's when the caeliar became mary sues.
Which is why they have to be devolved to be somewhat interesting - as you yourself pointed out in previous posts:
"But even then, it wouldn't be the first time later writers come along and change what another writer intended in the interest of good story telling."
The klingons/romulans can completely hide their ships from the federation; the people from 'When the bough breaks' can do the same with an entire planet.
Their technology is PRIMITIVE by comparison to that of the caeliar, in every respect.
If they could hide completely, the caeliar can do so effortlessly.
You keep saying this, but this is based on things
not in the book(s), what I'm saying is based on what we saw in the books and we saw it multiple times. If it's so easy for them why didn't they do it? Arrogance? This sounds like yet another imperfect Caelier flaw.
The caeliar superlative technology was more than proven at the end of "Destiny":
"The caeliar,
in all of 5 minutes, assimilated the borg:
They beat the borg by playing the game it was expert at (assimilation), got pass all the collective's formidable defenses, transformed trillions of drones, uncounted artifacts - all this FAR faster than it would take even a subspace message to reach all the collective."
That's so far above anything the klingons/romulans/etc, etc can do, it's ridiculous.
As for why the caeliar didn't hide properly, I already addressed the issue:
"What we saw in destiny was a half-assed effort on the part of the caeliar to hide themselves.
Real world reason - our 'heroes' had to find them in order to be saved by them.
In story reason - easy enough to make one; in any case, the caeliar don't care much about being discovered - during the romulan was their world was not even hidden in any way."