If we had interstellar level of tech we could synthesize aminos, carbs and fats more efficiently than we can with agriculture. We could probably do it right now

If we had interstellar level of tech we could synthesize aminos, carbs and fats more efficiently than we can with agriculture. We could probably do it right now with processing simple organisms like algae or what not if push came to shove - with enough R&D $ spent, but all forms of agriculture get subsidized enough that it doesn't even let alternative competition come up. I'm not saying agricultural disasters can't have very negative impacts on society (especially less developed countries that have to bid for same food as developed countries on global market) but such sci-fi plots are rather unconvincing.