I am trying to understand the advantages that humans have over other species, besides what you could call 'sentience-critical'.
What I mean by this is, the first set of answers you'll get is "more capable brains (in general), opposable thumbs, tools, comunication". But all that is core to sentience and civilization, not primates. I am more interested in the second set of answers, such as 'better temperature management'.
I suppose the question is, what advantages do primates have over other animals? Or, what traits are likely to be missing, compared to humans, from a hypothetical non-primate sentient creature?