... it is obvious that the Imperium controls the flow of technology for its own purposes and the purposes of the megacorp ( who are the real power in the Imperium; they are owned by Imperial nobility ).
Consider the following;
Most member worlds were not settled, but were re-contacted after the long night.
If the worlds were accepted as equals and not as subordinates to a central power which keeps them subordinate, then why aren't tech levels consistent across the realm? Because the "maintenance of an unequal economic, cultural, and territorial relationship, usually between states and often in the form of an empire, based on domination and subordination." prevents most member worlds from advancing.
The tech levels aren't consistent because the game maker wanted inconsistent tech levels. Makes play a bit more interesting - everything from bows to FGMPs are out there. The closest thing to an explanation that canon gives is, "The degree of technological expertise, and thus the capabilities of local industry, depends greatly on the basic characteristics of a world. ... The technological level is used in conjunction with the technological level table to determine the general quality and capability of local industry. ... In most cases, such goods are the best which may be produced locally,
although better goods may be imported by local organizations or businesses when a specific need is felt. ... Technological level also indicates the general ability of local technology to repair or maintain items which have failed or malfunctioned." (Book 2, TECHNOLOGICAL LEVEL)
In other words, it depends on what the local industry can manage: California is not at the same tech level as Haiti. Since canon does not cite a reason, it is up to the game master to develop a rationale that suits his game style and view of the setting. Maybe there's an active effort by the Imperium to maintain "an unequal economic, cultural, and territorial relationship." Maybe it's a relic of a long-past imperialism that the 3rd Imperium never recovered from - or never cared to fix. Maybe the folk that settled here or there have cultural reasons or economic reasons of their own for not building an industrial base capable of manufacturing FGMPs and micro-reactors. After all, the Pennsylvania Dutch are not riding around in horse-drawn carts because some outsider is imposing an unequal relationship on them.
One thing of note: the Third Imperium by canon evolved from the clash of an intensely conservative culture with an intensely change-oriented culture, a clash that was directly responsible for the Long Night. Given that history, Third Imperium culture may be fundamentally resistent to rapid change at the grass roots.
... Max Weber* defines the state as a community successfully claiming authority on legitimate use of physical force over a given territory; territory was also deemed by Weber to be a prerequisite feature of a state. ... Given that imperialism is defined as "the creation and/or maintenance of an unequal economic, cultural, and territorial relationship, usually between states and often in the form of an empire, based on domination and subordination", are the member worlds really as allied and pro-Imperium as we've been led to believe? ... Imperialism always involves the massive export of capital to foreign countries for the purpose of exploiting and dominating both their labor forces and their markets. Imperialism, the highest stage of capitalism, represents the stage at which a country's consumers cannot buy all the products that have been produced, and additional markets must be sought after. ... According to the Marxist historian, Walter Rodney, imperialism meant capitalist expansion. It meant that European (and American and Japanese) capitalists were forced by the internal logic of their competitive system to seek abroad in less developed countries opportunities to control raw material, to find markets, and to find profitable fields of investment.
As the Imperium's main feature is that it controls the flow of trade and technology ..................
Uh ... wow. That's a whole lot of weight to rest on that one word, "Imperium." However, I don't think the game designers were referencing Marxist historians when they designed the game, and I don't see much in canon that supports that view. Certainly, there's nothing there about the Imperium controlling the flow of tech - Book 2 says pretty flatly that they're free to import whatever they think suits their needs, it's just that local industry might not be capable of repairing it. So, you can buy a laptop computer in Haiti, but parts for it are going to be shipped in from someplace else. I also can't see anything suggesting the Imperium controls the flow of trade.
Instead, we're given a universe in which the member planets are almost completely autonomous within their own borders, in which the Imperium's demesne is restricted to space itself and any control of trade is exercised by the planetary authorities themselves.
Traveller Adventure, "The Imperium": "Spreading across a vast expanse of stars is the lmperium (more properly, the Third Imperium), ruling more than 280 subsectors and 10,000 star systems. It is more accurate to say that the lmperium rules the oceans of space between the islands that are the star systems and worlds than to say that it rules the worlds themselves. The Imperial Navy guards the borders against foreign attack, keeps the trade routes free of piracy, and protects member worlds from aggression by other member worlds. The Scout Service encourages trade by publishing accurate planetary and interstellar charts, contacting new markets beyond the borders, and administering the express boat service for swift transfer of information. Other services of the Imperial government include the enforcement of a basic framework of laws governing interstellar commerce, funding of basic research in all branches of science, economic and military aid to member worlds whose internal stability is threatened, and many others. In return for and in support of all the Imperium provides, its member worlds pay taxes."