RBE is also common sense. Did your parents charge you for room and board when you were a child? Would you charge your elderly and infirmed parent for such support? Just extend that concept and treat everyone as your family. It is much easier to understand when survival is a higher priority in situations such as total war.
The problem is scale. This approach just doesn't scale up. It's also a trust problem. How do we trust to be the bread earners and distributors in the global family?
The actual antithesis to capitalism is not communism or an RBE (which would be state capitalism), it is self-sustainability, even where it does not seem to be economical at first sight to abstain from large-scale division of labor. If everyone lived in their own biotecture earthships with solar power and 3D printers (or even more sophisticated replicators), i.e. when all basic needs are provided for without having to be distributed by an authority, only
then we can
perhaps do away with money, as any projects beyond that may (or may not) be accomplished with a voluntary and open source mentality.
But HOW do you keep an economy alive if more and more and more jobs keep getting replaced by technonolgy? Eventually even surgeries will be made on a machine like the one Prometheus. Maybe in 100 years, who knows, but it will eventually happen. Even if it's far, transitions have to start happening at some point.