But if you want more than basic, then you have to perform labour of some sort. Want to take the trip to Mars? Gotta work for it.
Yes, there will be a difference between those who labour and those who don't, but I still think it would be a huge win if noone in society would ever struggle to put food on their table.
There's a struggle between retired pensioners and everyone else in society about how much retired citizens should get, but there's still an understanding on both sides that past labour has some value, but that that value is less than present labour, so there's a balance. I hope the same would be true in a post-labour society.
And, of course, the difference between the labourers and the not-labourers would be an incentive to reach post-scarcity where that difference is wiped out.
This is already a reality in many countries. It would be very easy to also make it a reality in the US. The resources are there.