Interesting debate here. Polynesia is on the very edge of being a blobciv. The term "polinesian" denotes a group of different, yet severely related cultures, rather than one wide race. It is a blob in the same sense that an "India", "Babylonian", "Mayan" or "Hellenistic" civilization is a blob.
As for my personal preference, I am of the opinion that if a historic political body has enough defining characteristics (or known defining characteristics) to be richly and properly represented, then it should be considered one single civ rather than merge it with anoter culturally linked civs.
In that case, I think that Maoris & Hawaiians are distinct enough to warrant a proper representation. You have one warrior islander culture (Maori) VS a diplomatic & sailor one (Hawaiians). And for example, we would need to include the Rapa Nui into some kind of "blob" if we would want to represent them, since we lack of enough historical records about them (we know little about their leaders, agendas and the likes, for example).