This statement received approval from many people and can be regarded as quite heartfelt.
Indeed, their opposition isn't due to any personal grievance against Yulan or the new generation.
Yet deep down, they all have a clear label for the new generation represented by Yulan.
And that is confidence.
Actually, this trait is demonstrated not only by the new generation born from the Gus Land project but also noticeably by the new generation on Blue Star, though more profoundly in Gus Land.
The reason is simple.
People like Yulan come out of an environment where Human Civilization is absolutely powerful. From the very beginning, their worldview and ultimate goals are centered on Human Civilization. Even after learning the truth about the cosmos, that his perceived world was just a B-level spaceship, or even knowing the greatness of Gus Land, the confidence engraved in his bones about Human Civilization remains unchanged.
Otherwise, such a proposal would never have been made.