I want to recommend reading the Hainish cycle alongside Earthsea rather than separately. Le Guin was doing something in both bodies of work simultaneously: asking what human universals look like from outside human experience. In the Hainish novels, this takes the form of alien anthropology that defamiliarizes Earth cultures. In Earthsea, it takes the form of a fantasy world built on non-Eurocentric assumptions.

Both bodies of work are arguing that human nature isn't synonymous with what any particular culture assumes is normal. In 1969, the year A Wizard of Earthsea was published, this was a more radical argument than it sounds now.

Le Guin didn't get everything right — her early handling of gender in Earthsea is something she spent the rest of her career revising. But the anthropological imagination that underlies both cycles is remarkable and still feels necessary.