I was thinking about the tech level of the Imperium, not as described by the TL scale so much as described in the day-to-day reality as the rulebook sets it out. It strikes me that the Universe which is described to us isn't really a true ultra-high-tech society at all.
There are energy weapons, but the damage they do is only a little higher than current projectile weapons - or they carry risk of mass area radiation contamination
There is fusion power - but the fuel consumption is relatively high, suggesting a fairly inefficient fusion technology
There is some artificial intelligence - but the suggestion is that the most powerful computer will only be as good as a high-skilled professional
There is some advanced medical biochem - but anagathics aren't exactly risk free or ubiquitous and apparently high TL medkits are actually no better at healing than low TL ones: and don't talk about cryogenics, they got the mortality rate down so far and then left it, deciding that was good enough for mass transit
There is gravity tech - but it is relatively simple "anti-grav push" and doesn't appear to be able to create gravity fields, so people still live on planets and spaceships still rely on solid material hulls
There is interstellar trade from the technological heart of the Imperium out to the rim planets - but also the other way, because rich high-tech planets cannot synthesise food but require it to be imported at great expense.
Now this isn't a criticism of the game, because actually this sense of being high tech yet not high tech is part of the charm of the setting, and really distinguishes it from, for example, the likes of Star Trek. But what, therefore, is the functional TL of the Imperium? It feels more like maybe TL9 or 10, with some of the trappings of advanced society but, outside of their spaceships, not a huge amount of really advanced, Arthur C. Clark magic quote-esque, hyper technology.
There are energy weapons, but the damage they do is only a little higher than current projectile weapons - or they carry risk of mass area radiation contamination
There is fusion power - but the fuel consumption is relatively high, suggesting a fairly inefficient fusion technology
There is some artificial intelligence - but the suggestion is that the most powerful computer will only be as good as a high-skilled professional
There is some advanced medical biochem - but anagathics aren't exactly risk free or ubiquitous and apparently high TL medkits are actually no better at healing than low TL ones: and don't talk about cryogenics, they got the mortality rate down so far and then left it, deciding that was good enough for mass transit
There is gravity tech - but it is relatively simple "anti-grav push" and doesn't appear to be able to create gravity fields, so people still live on planets and spaceships still rely on solid material hulls
There is interstellar trade from the technological heart of the Imperium out to the rim planets - but also the other way, because rich high-tech planets cannot synthesise food but require it to be imported at great expense.
Now this isn't a criticism of the game, because actually this sense of being high tech yet not high tech is part of the charm of the setting, and really distinguishes it from, for example, the likes of Star Trek. But what, therefore, is the functional TL of the Imperium? It feels more like maybe TL9 or 10, with some of the trappings of advanced society but, outside of their spaceships, not a huge amount of really advanced, Arthur C. Clark magic quote-esque, hyper technology.