Condottiere
Emperor Mongoose
Compatibility.
Everyone should read that novel.This shows up in a big way in the novel The Mote in God's Eye, for example (I won't spoil).
Of course you can have variations because of local politics or conditions. But the fact is that all but a handful of worlds are colonies. Someone came from somewhere else with already developed technology and established the place. And there are existing blueprints, standards, etc available to anyone who has access to interstellar trade. Sure, some worlds backslide and survived to redevelop their technology. In some cases without access to the original tech because of calamity.This would be true if TL was knowledge but it’s not its infrastructure which has to be built on site. Every imperial world has access to TL 15 database but that has little to do with that worlds TL. Now infrastructure can be weird because there can be many reasons for it to be limited even for it to backslide.
Except depending on how the backslide can vastly change that, example a nuclear war that destroys all the infrastructure in a high tech society can actually destroy the knowledge base that created the infrastructure making them start from scratchOf course you can have variations because of local politics or conditions. But the fact is that all but a handful of worlds are colonies. Someone came from somewhere else with already developed technology and established the place. And there are existing blueprints, standards, etc available to anyone who has access to interstellar trade. Sure, some worlds backslide and survived to redevelop their technology. In some cases without access to the original tech because of calamity.
But in all those cases, it is NOTHING like how tech on Earth developed. It isn't going to have the layers of obsolescence, multiple origins, and whatnot that generates a lot of our infrastructure. Examples of how TL 2 decisions still echo in our TL 8 decisions are interesting, but not particularly analogous to the situation on a colony world. They never built expensive low tech infrastructure that needs to be removed before modern infrastructure can be installed. They had the modern infrastructure first in the vast majority of cases. (Yes, I am aware there are scattered exceptions)