Each language is a unique repository of facts and knowledge about the world that we can ill afford to lose, or, at the least, facts and knowledge about some history and people that have their place in the understanding of mankind. Every language is a treasury of human experience. Eyak doesn't give a damn about tenses. But it sure does give a damn about other things, much more than I do. Therefore it broadens your thinking, enriches your ability to understand the world- to deal with reality and experience.