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It's not the water content per se I think, most herbs thrive in this medium as well. Most probably the crops' price and growing speed are the deciding factors.

Oh, and check this anecdote out: https://www.thenational.ae/uae/from-paddy-fields-to-uae-dese...

Once topsoil is depleted, the economics change drastically.

Point is, we won’t starve. But we will need to expend more resources gathering food.

Given that cereals tend to not be too good for us ... maybe we should limit them anyways?

Perhaps but we also use cereals and row crops to feed livestock (corn), make vegetarian protein (soybeans, canola, wheat) and make our clothes (cotton). None of these can be grown hydroponically.

Hemp gives you all those things and grows extremely well hydroponically.

More importantly, hemp grows well in poor soils.