You're right, although farmed animals eating grass has its own complexities such as deforestation, low yield per hectare, methane emissions & "non-arable land"

You're right, although farmed animals eating grass has its own complexities such as deforestation, low yield per hectare, methane emissions & "non-arable land" actually being a vague/relative category where hardy food crops like alfalfa can often be grown. But overall if the world moved to exclusively grass-fed meat it would be a massive improvement.