Completely agreed. Distance will impose substantial challenges, but the good thing is that that's really the "only" big challenge there is. I think many people have this mental model where the Moon is easy and Mars is hard, perhaps because we've already set foot on the Moon and so clearly it can't be that bad.
But if somehow both of these bodies were orbiting around Earth, Mars would be just orders of magnitude more straight forward than Mars, and I think it's relatively likely we'd already have permanent outposts, if not colonies, there. So the mental model of it being viewed as a stepping stone is somewhat misleading. The Moon is hard!
And also I don't think the distance will be that bad. We've already had 374 day ISS stays which is far longer than any possible transit to Mars (though nowhere near as long as a late-stage mission abort would entail) and the overall effects of such a stay were not markedly different than significantly shorter stays on the ISS. So it seems very unlikely that even a late stage emergency abort would be fatal.
But if somehow both of these bodies were orbiting around Earth, Mars would be just orders of magnitude more straight forward than Mars, and I think it's relatively likely we'd already have permanent outposts, if not colonies, there. So the mental model of it being viewed as a stepping stone is somewhat misleading. The Moon is hard!
And also I don't think the distance will be that bad. We've already had 374 day ISS stays which is far longer than any possible transit to Mars (though nowhere near as long as a late-stage mission abort would entail) and the overall effects of such a stay were not markedly different than significantly shorter stays on the ISS. So it seems very unlikely that even a late stage emergency abort would be fatal.