I agree with your view. While I'm not a Latin Mass devotee, I do think there can be some mutual enrichment in theory. After all, it was the form of the Mass for many centuries. Unfortunately, in my experience however, the true Latin Mass devotees have a kind of "siege" mentality that does not permit them to see anything of value or worthiness outside of the cause to which they have become devoted.  A lot of them view any kind of "dialogue" as a watering-down of Catholic tradition. Even Benedict XVI incurred their anger when he revised the old rite to disallow praying for the conversion of the Jews on Good Friday. It has become a stand-in for an ideological worldview which unfortunately has re-enforced divisions & dis-unity.