It’s not necessarily the case that language preservation offers something of strict “value” (however one defines value and I do think that’s a big open question

It’s not necessarily the case that language preservation offers something of strict “value” (however one defines value and I do think that’s a big open question) outside of comprehension of historical documentation, but yes, it is the case that language is a method of continuing the culture and lifestyle passed onto us by our ancestors. If the Mannish people feel like reviving the language reclaims something that has been lost by English oppression, more power to them!