"Earth stuff" was bad phrasing on my part. The actual dichotomy is "naturally evolved systems" versus "designed systems". I might be an optimist, but I DO think designed systems can self-sustain in space. Not today- the tech isn't there yet - but soon. However, naturally evolved systems - like humans, non-bioengineered humans - I don't think will make it past a few generations, or, if you move a HUGE generation ship, a few thousand years. But it's always going to have a "use by" date without designed systems integrating with the naturally evolved systems.
When it comes to ALIEN natural systems, all bets are off. Who the hell knows what happens when we interact with that - even super-duper-ultra-tech designed systems might not be able to correct in time if two completely alien biologies interact destructively.
Curious though: what else was "magical thinking"? That's something I take pretty seriously - unless I'm doing it recreationally, which I am not - so I don't want to leave it hanging out for the universe to see.
Is it possible to even approximate a universal/perfect insulator? If not, then there will always be some situation in the universe that will have some effect on a static entity, unless it stops being static by adapting. Now, in terms of human bodies, these adaptations may be quite fundamental (i.e. on a genetic level)
Adaptation is just another word for "complexity breeds complexity," which is just more words for "entropy," which is just another description of all fading to static white noise background radiation, until it all fades into the heat death of the universe.
The question is whether you choose to resist entropy and slow down, or embrace entropy and burn bright.
Whichever path you choose, make the most of it my friends!
> I just think it's impossible for us
You think whatever you want but your reasoning is not convincing.
What makes technology not of Earth? It is “just systems of systems composed of stuff that's Earth stuff“.