Nuer and Somalis are very different from Basseri, and the Sarakatsani and Reika are markedly different from the others.
I find that many current theoretical stances undermine substantive anthropology, and need a challenge; even if "that gets old fast," it is a necessary response to ill conceived and counter-productive "theories" that currently hold sway.
"I would be interested to hear a response to the main question of this thread and the issue to which I devoted most of the content of my last comment, that is, the reluctance of anthropologists to discuss cultural differences."
I don't understand this claim. Who are you talking about? The last time I checked, looking at differences and similarities is a huge part of what anthropology is all about.