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Correct me if I'm wrong but that agricultural impact happens for vegetarian food as well? And lab grown meat also requires the same agricultural costs, there doesn't exist some magic chemistry that creates food from raw materials without agriculture.

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I updated my post with some details, but to that point directly it is far, far more efficient to feed people rather than feeding animals to feed people. The vast majority of cattle are raised in feedlots and fed crops from agriculture.

Grains make up 10–13 percent of the diet for cattle, globally. The rest is composed of grass, leaves, and "crop residue" such as cornstalks.

Source: Sacred Cow by Rodgers

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