I partially disagree. Certainly it is very important from the perspective of providing material about the native countries of those languages.
I don't partially, I completely disagree. While these communities might not be English based, and many of the members don't even speak English, we wall want to see every single Wikipedia, regardless of language, grow and flourish with information from cultures universal.
I have often found better articles in German (where "German Indianer" books are some of the best selling books of all time and entire festivals are based around Native American Plains culture) about Indigenous North American communities than in English. Cross-language is a necessity in this global age. And sharing content with other language based Wikis can also help to update resources, break stereotypes about cultures and encourage respect in regards those communities. It also allows people to understand that there are "others" out there. It takes away from the centric-aspects of some language Wikipedias, something that people often accuse English Wikipedia of doing.
Information is the language of Wikipedia as a whole, and we must learn how to make the utmost use of that language in order to continue our mission to disseminate knowledge on a worldwide scale.
-Sarah