What defines the technological advancement one chooses is personal preference and convenience. I don't remember anybody throwing flat IGNOREs back when I decided to RP two concurrent versions of Solar Communes. A pre-ESUS one shaped in almost exclusively Hard Sci-fi existing in the 2200s AD timeline and the current one existing in the 6th millennium. It's also a matter of coherence, and even though there is no way to compare both versions, superficially the Far FT version of Solar Communes only leaning from hard science are in minor unobtainium like metallic hydrogen, uber materials that allow c-frac gauss guns and practical brain transplants and brain links with remotely controlled bodies.
It is actually dependent on whether one's goal is to go farther for writing a story that one feels more assured to do without having to research basics of RL science every time something is done or just to make an uber-awesome 1337 KILLER FLEET!!!! If the former, definitively it will be accepted, but if it is the latter, someone bigger will always come, or then an IGNORE will be in place if it gets too far.
As for the Solarians technology...
We distinguish between two kinds of technology, which we will call small-scale technology and organization-dependent technology. Small-scale technology is technology that can be used by small-scale communities without outside assistance. Organization-dependent technology is technology that depends on large-scale social organization.
It is in its very essence small-scale, mostly thanks to the advances of nanotechnology(ironic I know, considering where that quote came from, although in the same way a totalitarian state that existed once in SC timeline used nanotech for absolute control over its oppressed ones bodies and minds). Anyone can do anything without joining a major order or organization, including even raising a space fleet.
Their main expertise is small-scale engineering and industrial technologies and Slower-than-light spacecraft technologies. They can tap everything a single star system has to offer with maximum efficiency and will manufacture better and faster unless they are being compared to another FT civilization in an universe where there is no Special Relativity, Causality, Newton laws of motion or Second Law of Thermodynamics. Likewise, they are one of the few FT NSes that build spacecrafts with c-frac slower-than-light interstellar travel in mind. There are always people with enough will to explore distantly, and as most people have access to the means to attempt achieving such feats, development is particularly fast.
Their spacecrafts are classifed as Assault Core(Battleship-equivalent, usually teardrop-shaped) and Prime Assault(Death Star-equivalent, usually shaped as toroids). Smaller spacecrafts are totally pointless and completely unused, unless missiles with their own weapon turrets and active protection systems can count as spacecrafts. Weaponry wise, coil guns and missiles make the gross of their usual firepower in space, exceptions being the ridiculously big Gamma Ray laser, the Ultraviolet laser beams(invisible but deadly) and a FT-ized THEL, which also uses ultraviolet laser beams. Their real focus however is in land warfare, as their past story involved a nearly three-thousand years war against a "1984 meets Brave New World" totalitarian police State to liberate mankind, and involved massive, sometimes centuries-spanning battles in disputed planets, slower-than-light travels that took decades.
According to many researches, a real Artificial Intelligence is impossible. The Solarians just have pseudo AIs that are extremely gifted at pretending they are intelligent, some which are directly integrated with their own minds.
The average Solarian tends to prefer simplicity rather than "super-powers", believing they are irrelevant as any Solarian can easily raise an army from the small organization technologies anyway. Every cell in their body is integrated with nanobots that are inside their cells, working together with the organic parts to the point they can duplicate together with cells, spread and all, including actually being passed from parents to children during the seldom cases of natural reproduction and natural pregnancy. Due to this fact, Solarians are sometimes classified as "semi-organic" as they are neither man nor machine, but simply people who have microscopic machines deeply integrated in their bodies in a symbiotic relationship.
That also means that they can be killed by very strong electromagnetic pulses due to their interdependence with such nano-machines. It's technically possible to return them to a purely organic state, but it requires specialized medical support and only the most ardent bio-conservatives perform such kind of nanite removal.