There are mega-efficient factory farms in Nebraska that are immensely productive per-human involved, but that doesn't mean what hobby farmers in Connecticut or subsistence farmers in Africa are doing is bullshit.
I think "bullshit jobs" are less of a thing than people believe. It's just that people devalue assembly-line or cog-in-machine work, even when they're the ones doing it - especially in the US where we grow up wanting to be a unique success story like an entertainment celebrity or rich entrepreneur and so that kind of work is antithetical to our idea of a successful person. Fact of the matter is, machines needs cogs, and we don't have an infinite capacity to replace human cogs with automated ones.