All we learned about the Breen in every episode they were featured in was that they were just generic cardboard villains used as a plot device to make the Dominion more powerful. They had no personality to speak of, nothing about their culture was stated beyond tidbits of hearsay, and the only thing that made them even marginally interesting was that we didn't know what they looked like, which they played up to death.
Nah, there is a wee bit more. The Breen are warlike, interested in expanding their territory, some small hints indicate they got an unpleasant history with the Romulans, there is the mystery/ running gag concerning their home planet usually described as a frozen rock until Weyoun states it is actually not, and they don't tell anyone why refrigeration suits are worn anyway. "Full of surprises."
I definitely understand where you're coming from but expecting explanations for all that is the ultimate pipe dream.
I'm pretty sure those comments are supposed to be ironic, this part alone...
I need it to include an explanation [...] why the Enterprise bridge in SNW is not built out of cardboard
gives it away, no?
They came up with different-looking Klingons for Discovery. Why? Damned if I know. Just because? Seems so arbitrary to me but that's the kind of stuff that they do.
They probably just wanted the Klingons to look more alien.
They came up with the spore drive. Something that wasn't mentioned in any later Trek. huh?
Because everyone and their mother in the ST universe can barely open their mouths without mentioning the Excelsior's transwarp drive, the soliton wave propulsion, the *Genesis Device, and a ton of other technologies or events (from the 23rd century).
Why would you expect mentions of a classified, failed experiment (from the Federation's point of view)?
*Well, Genesis gets a single, very brief reference in VOY, but in hundreds of episodes before (and after) there was nothing, not even when a scientist revives a dead star with protomatter in DS9.
Good storytelling would make it all fit together.
No, it would only make it contrived and silly like the Klingon Augments. Sometimes reality simply retcons stuff like outdated computers, cheap sets, no female captains (TOS), limited budget for make-up etc., and it's just better to accept the outside-of-universe reasons.
the info about their ships being organic wasn't true (although that was probably due to an oversight on the writer's part)
Since when? Tuvok says they have "organic-based vessels" - and we don't even know what exactly this means - so not necessarily EVERY Breen ship is organic, while only one ship class is known that actually may be (partially) organic, it's not like they all have to look like giant squids or something. Perhaps only the inner structure is made of o. material, perhaps the outer hull is but appears to be metallic, perhaps their military doesn't even use them in the first place...