Honestly, I would LOVE to see more Lore explored for each Clan. I definitely fell in love with the Xaela's rich history, but I agree, every Clan deserves similar depth where possible.

To me, it almost comes across as the Raen are just "normal people-Au Ra", in contrast to the Xaela, who are all very specifically tribalistic. I'm personally not a big fan of Mikoto, and it struck me as a case similar to the Miqo'te, where an NPC was added that is essentially just "human", but given another race, just to avoid too many Hyur.

In truth, I would've suspected that the Raen would be the predominant race in the nation of Kugane (the "Japan" to Othard's "China/Mongolia"). Who knows, maybe that will be the case later on after all, given what few Raen settlements exist, all seem expressly Japanese in nature.