Because you can eat the soy directly and remove the additional land loss, water use, soil compaction, acidification, storage cost, transport cost, cooling cost,

Because you can eat the soy directly and remove the additional land loss, water use, soil compaction, acidification, storage cost, transport cost, cooling cost, butchering cost, shipping cost etc. that comes with introducing another link in the food chain. Feed conversion ratio for beef is something like 1:6-10, and that's ignoring everything above.