This just isn't true. It seems true, because we can treat interstellar travel as a problem of scale, but it doesn't follow that "build big rocket" equates to "g

This just isn't true. It seems true, because we can treat interstellar travel as a problem of scale, but it doesn't follow that "build big rocket" equates to "go fast and go safe". The energetics of interstellar dust, radiation, the long timelines of travel. It's not clear at all.