Your claims that all this is easy and entirely possible - has no evidence, because near as we can tell we haven’t seen anyone visiting us or anywhere we’ve seen with any of these setups. And we haven’t successfully gone even beyond our moon with a manned mission.
I don’t think anyone is claiming intergalactic colonization is impossible.
All I’m saying is it doesn’t seem worth the cost, by any metric we currently have, or straightforward to actually do, based on our current understanding of physics.
And that there are a lot of real issues with trying to do it that would make it unlikely to succeed if we tried right now, without making it even more costly.
Where did I say that? I didn't.
> I don't think anyone is claiming intergalactic colonization is impossible
Let's look at what they actually said:
> Intergalactic travel is borderline impossible barring unknown physics or travel very close to the speed of light.
And I was arguing against that claim, which I believe is clearly spurious. You seem to agree with me on that.
> All I’m saying is it doesn’t seem worth the cost,
I don't see it as fundamentally different from interstellar colonization in that respect. Anyway, lots of things are done for the hell of it, and on the scale of a galactic economy an intergalactic colonization program would be less than pocket change.
A colonized galaxy will have people mostly living in artificial habitats. A starship of sufficient size is just an artificial habitat moving at high speed.
One would get around the issues you discuss by just sending multiple vehicles. And anyway, this is in rebuttal to the idea that intergalactic colonization is impossible. The onus on that argument is to show it can't work, not argue there are obstacles that would make it uncertain in any particular case.