Earlier quoted context omitted.
Much easier than the logistics of keeping a robot operational in the field. You don't care whether the Taliban captures your flesh and blood mule, but you really don't want them capturing your world's-most-advanced robotic mule.
Why? What are they going to do with it?
It is fairly common for countries to let other powers take a look at technology that lands in their hands (sometimes before returning it to them). See for example https://en.m.wikipedia.org/wiki/Viktor_Belenko#Aftermath