It is something extremely subjective, the Bullfighting Economy and industry was devastated by the jihad and nobody gave it credits to rebuild anything, they rebuilt it by lungs and they have lost an uncountable amount of factories and worlds, and therefore resources, but magically in 3145 they flourish you make like roses
The Hegemony beyond the attack with the neutron bomb against the capital city there was no damage to its infrastructure, even mostly the factories were beyond the affected area, if technicians were lost, but that is formed in a period of time of no more of 10 years and you replace all the lost personnel, and all this without counting the factories built in other systems such as Pompey, Horatius, Addhara, Baccalieu that continued working quietly
The non-technological development of the Hegemony is pure incongruity of the writers, and it comes long, with a book contradicting the one that follows, all the other states modernized their lines of primitives
The Hegemony built Centurions, Gladiator, Icarus II, Emperor and others but when lines had to be modernized it seems that the Hegemony by decision of who knows who continued to build only Centurions and always primitive