The cover blurb makes it sound like a cautionary tale about our highly-tech-dependent world (even in the 1990s!), but it's not the technology that's the problem. It's the homogenization of culture, and the insistence that there be one perspective, and only one perspective, that really matters.
Think of how we travel and find the same chain stores, chain restaurants, the ISO standard Irish Pub with its bric-a-brac decor, and how our TV and movies are full of endless reboots, spinoffs and sequels.
We see it first in Sutty's memories of Earth, controlled largely by a theocracy until contact with alien civilizations kicks their support out from under them. And then in the world she's trying to understand, one that's undergone a complete transformation in the time it took her to travel there at relativistic speed. She knows there were flourishing cultures here before she left Earth. She studied the few …