Why do engineers need bosses? They really dont. Most successful businesses are founded by engineers and led by engineers. Bosses just peddle the product down the line into the market and get all the cash. Engineers do not need the bosses, engineers can sell the product on their own just like they can produce it, research it, develop it, most successful businesses ARE engineer led.
Why do the engineers need peasants? I have already seen farms, where drones take pictures and apply fertilizer depending on how the soil looks, I have already seen GPS led self driving harvesters. Engineers do not need agricultural workers.
Why do the engineers need mechanics, technicians, electricians etc? They dont. They really dont. Everything they do, engineers do better. Everything. These guys are just some sort of engineers that dont know math, and so they cant see the world as precisely, they cant figure out the mystery of what is going on around them. There are already factories without any workers, all thanks to engineers.
Now, security. I can see why engineers need security. But 80% of casualties of modern armed conflicts, come out of artillery. There are pilotless fighter jets too these days. Engineers can basically take over the entire multi trillion defense sector.
About politicians and lawmakers, none of them really understand the technology that makes society possible, and they are usually 10 years behind with their regulations, and also they pretty much just give the technical advisers the task of writing laws.. basically engineers do not need those either.
In conclusion: Engineers have a class interest of getting rid of everyone else. Scientific people (as long as its not too theoretical but applied) have the mental back breaking labor of automatizing, producing, optimizing, and basically delivering ALL the results. And everyone else just leeches off of it, or slows down progress.
Engineers of the world need to unite, and overthrow everyone else. If engineers seized the resources of everyone not-engineer, humanity would be on Mars or who knows where by now.