During its Golden Age, which followed the War of the Primes, Cybertronian civilization maintained links with other planets that surrounded other stars. Via a network of space Bridges (constructed with technology the workings of which have long been forgotten) populations of Cybertronians on far flung planets maintained contact with Cybertron. Gigantion, Velocitron, even the Hub, were all, back then, part of the greater Cybertronian culture.
Being the last of the original Thirteen Primes, Alpha Trion has been alive since the very beginning of Cybertronian civilization and had written the Covenant of Primus – a book describing the history of Cybertronian civilization from its beginning, in the distant past, to its end in the distant future. So, it was natural that Alpha Trion thought he remembered the whole history of his civilization. However, he was wrong. After all, he wrote the early pages of the Covenant of Primus in languages which he, along with other Cybertronians, have forgotten thousands of star cycles ago. More importantly, Alpha Trion often wondered what it would be like to understand the Covenant of Primus in its entirety - to assimilate all of the knowledge, the consciousness of the past, yet alone the future, of Cybertronian civilization.
Hence, despite what Alpha Trion thought he remembered about Cybertronian civilization, its caste system developed at the very beginning of its Golden Age (not some time after it). Thus, while some (like Alpha Trion's prominent subordinate in the modern era – Orion Pax) were tasked with cataloguing all new information about their civilization (the caste of Archivists), others built and engineered, ran commercial enterprises, governed, made laws, or even fought in the gladiatorial arenas. In fact, during Cybertron's Golden Age, the gladiators were respectable professionals (rather than members of the foundry workers' caste who abandoned their work in the foundries in favour of promises of fortune and glory in illegal gladiatorial pits) whose job was viewed as an important inspiration for all Cybertronians to fight nobly for the great ideals of the Primes.
Despite this seemingly rigid social structure, during Cybertron's Golden Age members of each caste had plenty of free time, while everything and everyone in their society encouraged them to continuously learn, think and experiment.
