I’m sure there are a few hurdles, but wondering what is the biggest reason that keeps us back at this moment as the most pressing thing. Is it that the technology just isn’t there yet? Or is it because of legal complications, international treaties and all that? Is it just not financially feasible to do at this present time with the technology we do have? That we could do it, in theory, but the ROI is too low?
The OSIRIS-REx did manage to bring back some material from Bennu. We retrieved 121.6 grams and it cost around a billion dollars. It took 8 years.
https://en.m.wikipedia.org/wiki/OSIRIS-REx
Edit: Fixed how much it cost.
Yes, but it still didn’t land. It very slowly approached then bounced while collecting the dust. This is probably the closest we have so far of landing.