Spoiler: On Orkz
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You observe of the Orkz various things: They had two Gods, Gork and Mork. One is Brutal but Cunning and other is Cunning But Brutal. This is often confused over which is which and what those means and fought over but when the orks can agree its generally thought it means that Gork hits you harder when your looking and Mork hits you when you aren't looking. The hierarchy here is pretty simple to understand: if your bigger and stronger than the orks around you, your generally obeyed. Thus the biggest ork is one in charge. But orks aren't the only life forms here: grots, little goblin like creatures seem to be smaller just as sentient creatures who work under the orks as their workers and doing all the menial things orks won't like selling fungus beer, coordinating bets when fighting breaks out, and generally being enterprising when they aren't being obedient but are cleverer and cowardly, though they fight whenever an ork makes them do it.
You analyze that an ork can get operated on by a Dok (Ork Doctor) its not a procedure that any human would survive: a Dok could chop off an orks head off a bad body and sew it onto an ork body that is intact but has no head and this would work- orks are incredibly resilient, which is good because they have basically 19th century level medicine by human standards. Other orks similarly display sewed on arms, legs and other cybernetics. They seem to have various backup organs and padding around them, and generally seem to be a symbiotic amalgamation of animal and fungus, but they also seem to be able to photosynthesize for energy as well as eat mostly meat and fungus. The blood of an Ork is also interesting, in that it contains countless distinct fungal organisms and has a chlorophyll high content, with trace elements of carbon and copper. So really they're more of a plant/fungus/animal hybrid. And yeah- there are clear signs that the orks are bio-engineered. Highly advanced bio-engineering and form what you can observe and analyze from your technology, this isn't their full potential. Whatever made them, made sure they'd degenerate down to their current forms and intelligence. It seems that while there are many forms of energy that make them live, only the psychic energy generated by fighting and war seems to make them grow and develop, and they don't really seem to have an upper limit to their age or how much they can grow, or how much their intelligence can grow.
Theoretically if you made a war big enough and had the orks fight in it, it would produce an ork as intelligent as a time lord assuming anything survived afterwards. Despite the state of the galaxy however this doesn't seem to fulfill the conditions to do: Ork biology wants the war to be more sudden, big and all at once rather than this long drawn out little conflicts across the stars adding up to a state of constant warfare over ten thousand years. Indeed, grinding wars of attrition don't seem to excite the orks as much and they will abandon such conflicts to fight more exciting fights, and its possible that the best tactic for dealing with the orks in a military sense is either assassination of a warboss to make the orks under them turn on each other a fabian strategy of not engaging orks in big fights and just whittling them down which would turn bored orks against their own warboss in search of a fight and thus break down into self-destructive violence just like killing the warboss would. Even then the spores produces from the orks corpses and the spores produced from them would need to be burned to truly make sure the threat of orks would go away forever.
Their technology is rough and crude, often ramshackle but functional, but often subject to constant poorly though out experimentation, trying to outdo the competition to build better guns, bigger things or faster vehicles, complicated by the fact that just use whatever they have on hand to make this or that, thus its not very uniform and how functional some of the more complex stuff they have can vary widely in functionality. At the same time some tech simply becomes inoperable if an ork isn't wielding it and Iota-34 would have told you that some of the Mechanicus believe that there is psychic field from the orks making their technology work.
Now how much their technology is simply due to orks being smarter than anyone gives them credit for or if their psychic belief field is making it work is a complex matter: the Mechanicus for one aren't exactly the most reliable or scientific source of study for this as they tend towards magical thinking, the Imperial army themselves have debunked this theory as guardsmen have tested their technology and confirmed it is simply extremely unreliable, and according to what Eldar history has been told to you by Kaerabrynn, the Orks were a weapon created by the Old ones in a long ago war and thus would have logically some instinctual capability to make technology to fight it that has deteriorated, and this is true: the Mekboys can seemingly speaking ordinary ork slang while randomly throwing out scientific jargon and being confused by what they themselves just said while they work their tech. At the same time, the psychic field theory is not entirely untrue as where the orks are getting their ammo or fuel from doesn't always seem to make sense, sometimes they have more ammo than they should or a trukk keeps going when it shouldn't, yet they have industry and do repurpose other peoples structures and designs to their own purposes- they aren't just mindless brutes. For example a completely functional Imperial knight redecorated in ork designs walks past, more mobile and functional than the ork gorkamorka mech right next to it.
Furthermore, when they paint stuff red, the red ones do actually seem to go faster, and some of the more.....questionable/bare bones shoota designs seem to run on nothing but belief, but these seem to be extreme exceptions rather than the rule. Generally, ork technology is crude but works because its well, technology, its just unreliable because orks aren't always the brightest lot but it gets the job done for their purposes. The belief thing seems to kick in to like, lubricate this and that here and there so that a trukk keeps moving or a shoota keeps firing without them worrying over logistical details too much.