This (other disadvantages outweighed) would be my guess as well. The facial neoteny makes me suspect some kind of global growth disruption, with harmful effects on the rest of the body.
Also, to the (probably substantial, though I haven’t read much about the question) extent that intelligence in the EEA was about within-group competition, Boskop wouldn’t have had an advantage over H. sapiens.
This (other disadvantages outweighed) would be my guess as well. The facial neoteny makes me suspect some kind of global growth disruption, with harmful effects on the rest of the body.
Also, to the (probably substantial, though I haven’t read much about the question) extent that intelligence in the EEA was about within-group competition, Boskop wouldn’t have had an advantage over H. sapiens.