They typically look like a cross between [[Star Wars|Jawas]] and [[/co/|Doctor Octopus]] with a healthy dose of [[Dune|The Bene Tleilax]], as well as wearing the sort of re-breather masks that you'll typically see on riot police.
Some fans like to claim the AdMech isn't holding back, that it's struggling to keep things together. While this is partially true, they could just teach people as a sort of mini-adept for specific tasks in tech that is hand-made or build servitors to do it. And when it comes to hoarding tech and not sharing it, that is exactly what they do. Technological decline can happen from war but only if you not only destroy the factories but also the information and kill everyone who has any of it memorized or simply knows enough to piece things together
. Seeing as almost all the fighting happens well away from Forge Worlds and Hive Worlds, that isn't an excuse that can apply to the Imperium. And technological development does not stagnate during war. War encourages advancement, not merely applying what you already have in new ways (it does do that, but not just that). If you don't research and develop more advanced science and create new technology, you're enemy will and you will lose. It's that simple. The only thing holding back the Imperium from having already returned to Dark Age levels of technology is the Machine Cult itself due to the Cult deciding who can study or build what using entirely theological decision-making and political maneuvering within the Adeptus Mechanicus. More importantly, the Machine Cult doesn't like non-tech-priests even having technology in the first place. The last thing the Machine Cult would do is share technology even when it can for the same reason real life Christian priests go through so much training and effort to even be allowed to bless and handle the Eucharist. To the Machine Cult, giving out technology to the rest of humanity (even though it was pre-Cult humanity that invented all of it) is just as blasphemous and unacceptable as a Christian priest going out and giving the Eucharist out like it's some sort of party favor and for the same reasons.
Basically, those who don't think the AdMech is to blame for the tech problems the Imperium has forget that there is no excuse for technological back-slide when you're industry is largely untouched by war and you have a literal nation of crazy scientists who have spent ten thousand years doing nothing and "forgetting" things that they had been building on numerous worlds and those manufactoria must have just what, magically vanished? And that losing the ability to make various technologies does not come from every manufacturing plant for it being destroyed and all the people who know how to build it or build the plants being killed and the knowlege itself being destroyed or literally lost. No, it's because the AdMech only let like one or two worlds build it and those planets were ruined by an enemy army. Lastly, these fans forget that the Adeptus Mechanicus never forgets anything. It keeps the knowledge of absolutely everything stored safely and ''explicitly '''chooses''' not to share it with anyone, even other Forge Worlds.'' And there's a backup on Terra which the Imperium is afraid to use because everyone knows the Mechanicus would basically go Horus Heresy 2.0 on the Imperium if the Imperium used that knowledge. Even worse is that the AdMech might be '''''right''''' because of the crazy advanced under-the-hood nature of Imperial tech and the insanity of the Dark Age of Technology. The situation is that messed up. For those who are still not convinced ask yourself this: if the Imperial Guard used the same technology (albeit built with an interest in keeping the user alive) as the Skitarii, would the Eternal War even still exist? Considering they already hold the line and often win against things they shouldn't be able to while wielding a weapon that is not unreasonably referred to as a flashlight and wearing armor that is little more than a mental placebo.
==The Commandments of the Mechanicus==