And yet they were, apparent the technological equals of Starfleet.Yet their Empire is older than the Federation, and in the 24th century is in technological parity with the Federation, in a few areas more advanced. Admiral Janeway used a Klingon time and position device to return to Voyager in Endgame.
Despite their violence and occasional civil wars, the Klingons would appear to have a stable and functional society.
I get your point. But, I also agree with the point that Deks was making:
"Trek did some of the things right, but I think it is highly unrealistic that there are as many uneducated aliens for space-faring civilizations in Trek as we've seen - I know they are there to generate drama, but COME ON, that just borders right down with ridiculous - most of the hostile species we've seen in Trek, especially the Klingons strike me as the type of civilizations who would sooner destroy themselves first before they venture out into the galaxy - although I guess that the Hurgh invasion gave the klingons the necessary space faring technology... unless this united them temporarily and then they decided to revert for whatever reason back to more primitive ways... )."
The Klingons are a fictional species. It is unrealistic (from my p.o.v) that such a species, as they are portrayed, would develop into a sustainable, functional technologically advanced civilization. The Klingons are tribal, they live and die by the motto 'today is a good day to die', they worship combat and warfare (self destructive behavior), they don't seem to value science or innovation, they are regressive, they hold the children accountable for the sins of their father, they have revenge killings, they engage in civil wars, etc.
As Adm. Cartwright described them, the Klingons are the trash of the galaxy. However, in the Trek universe, the Klingons are who they are; and their backstory is whatever it is. I accept that. I am more than happy to suspend disbelief in order to enjoy the show.
I don't want to pee in your cornflakes, but the Achilles' heel of your argument is that this is already water under the bridge, so you might be up the river. But I don't want to beat a dead horse.
Yes, I know it's a horrible mashup of idioms, but I'm making a point here!

Plus there's all the visual memes that instantly convey ideas that, like the linguistic idioms, don't make sense unless you're familiar with the history or already know what they're supposed to mean. One might argue that the Tamarians are actually more culturally developed than Earth since their language has drifted to be completely made up of metaphor/idiom shorthand. One little phrase in their language may be the equivalent of a novella of information in ours. I don't see how that would prevent technological advances, and may actually imply the opposite, that they're capable of quite advanced thinking.
You are whistling in the dark. It's not over till the fat lady sings.
Developing advanced technology and navigating through space requires precision. Communicating in metaphors is problematic. Metaphors are not precise. Mathematics and physics require precision. You have to mean what you mean. Metaphors are usually ambiguous.
Also, the two parties that are having a metaphoric conversation have to know what each other is referring to. If you have no idea what or who Jalad, Temba and Tanagra are, then you cannot effectively communicate.
Even if one did know what those names are referring to, one party might have a different interpretation of what the person, place or event means. If you cannot say what you mean and mean what you say, it becomes a mess. A captain can send a ship crashing into a meteor before the helmsman can figure out what the captain really meant.