Yes, let's compare the possibilities. We'll use the 22nd century as an example as it's certainly pre-TOS, and it's a favourite era of mine.
The 22nd century was a time when humanity wasn't the top dog in the galaxy. Earth didn't have a massive fleet, the best technology, or centuries of interstellar experience. But what it did have was courage, determination, boldness, and the drive to explore.
Humans ventured into the true unknown, charting unexplored space, encountering new species at every turn, and laying the groundwork for lasting diplomatic and scientific relationships. They faced conflicts with far older and more powerful civilizations, including a brutal war with the Romulan Star Empire. But from the ashes of that war came something remarkable: the beginnings of a lasting alliance that would become the United Federation of Planets. It was an era of risk, struggle, and forging identity.
Compare this with the 24th century, a time of peace, prosperity, and near-utopia. The Federation has become a major galactic power, guided by principles of cooperation, diplomacy, and post-scarcity idealism. Yet this comfort has come at a cost. Many characters of the era seem emotionally distant, sanctimonious, and arrogant, insulated by technology and protocol, and confident in their moral superiority. They quote regulations as if they were scripture. The hard edge that once defined early explorers has dulled.
It takes a force of nature like the Borg, or a brutal wake up call like the Dominion War, to rattle their cage. Only then is the Federation shaken from its idealistic slumber and reminded of the dangers that still lurk in the wider galaxy.
The 24th century may be the world the explorers of the 22nd century dreamed of, but too many in that era have forgotten the grit, the sacrifice, and the fire it took to get them there.