What is the primary reason nomadic pastoralism instead of transhumant pastoralism flourished in the northern area of Afro-Eurasia?

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The steppes, which are the northern area of Afro-Eurasia, were not conducive to large-scale agriculture, but they were able to support large herds of grazing animals. Therefore, nomadic pastoralism, in which people move their herds from place to place to find sufficient grazing land, was a more viable way of life than transhumant pastoralism, in which people move their herds seasonally between highland and lowland pastures.

What Is the Primary Reason Nomadic Pastoralism Instead of Transhumant