This idea that Arabised Arabs carry little amounts of Arabian dna needs to be thrown in the bin. For example, Algerian Arabs carry substantial Arabian dna on average at 30% and Sudanese Arabs carry around 30% or more.Arab is a linguistic term more than anything, lots of "arabs" from arab countries have little actual arab dna.
Even if we do share ancestry with them, why would we change ourselves to be like them? Ancestry doesn't mean we have to be the same.
We're already practically the same as the Arabians culture-wise, from what we eat to how we dress. It's only natural that we learn Arabic as a people to further cement our relations with the Arab World and enjoy the privileges that come with being an Arab in places like Doha, Dubai and other rich Arabian cities.