Subsistence farming isn't a reference to famines, its a reference to inequality. My point was that even today, the majority of the civilized world spends their time doing endless agricultural labor for minimal benefit, even though one would think that we would have a better alternative implemented by this point (especially since anthro studies have shown that by and large hunter/gatherer societies spend much less time obtaining food and water than farming ones do).

And my earlier point on famine was that it was a much bigger problem for heavy agricultural societies in centuries past than it was for tribal societies; a bad harvest one year for a civilization could have disastrous effects, while a tribe could generally pack up and move.

And finally, while I agree that the future is abundance, I'm not convinced it's going to be abundance for everyone. Up to this point, wealth in every single civilization I can think of has been heavily stratified, with the top few percent taking the majority of everything (doesn't matter if its nobles, priests, corporate leaders or politicians). I don't really see this changing given our current political/cultural/economic systems, unless basic income becomes a thing (and even then, the stratification will remain; it'll just become irrelevant on a long enough scale of technological improvement).