It is like asking Chinese speakers - with their 3000 years of history and strong languages and cultural bounds, why they don't adopt words from English? Older languages with a beauty of their cultural traditions and roots are important piece of the original heritage, which is really demonstrating the stability or instability of the certain idioms. For further discussion you may refer to the scheduling the tutoring session or research of any Polyglot conferences in your area. I hope this helps
