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2. Shemuren (色目人) - Tanguts, Muslims
Semu also included Central Asians and the relatively small number of European merchants and missionaries in China.
Is the Yuan system based on how long ago a certain people were conquered? For example, Central Asia and Xi Xia were the first conquests by the Mongols, followed by the Jurchen-Jin, and lastly the Southern Song. Thus those conquered earlier were likely to be more loyal than those recently conquered. If so, then the system was not as "contemptible" as the Chinese like to see it as, and was instead quite pragmatic. Of course, the southern literati hated the feeling of not being on top as they had always been in the Song dynasty.
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from what i understand, the mogol empire was very nomadic. Troops would march through different areas, conquer, then move on. The soldiers wives and children would also follow. This ultimately led to the fall of the yuan. After 90 years of constant movement, they needed rest.
On the contrary, it is said that the Mongol troops of the Yuan got too sedentary in their city garrisons and their military skills and discipline deteriorated.