I think Code_Red made some very valid points and so have you. The one thing I do not agree with is that we make our cultural practices or amenities secondary. I think we should not as long as they are not in violation of Islam. What I would agree with is that we should be able to adapt between the good things of cultures shared by muslims from different ethnicities. Each culture develops for the ease and extravaganza of the its society, its the extravaganza we should be weary of. However when living in another cultural domain we should try and adapt to those things which make it living easier in their native domain as long as they are in compliance with Islamic principles.
I agree, niqab is not mandated as a requirement. Its more an issue of zealousnessless of Arabization. Another one from our own regional culture would be the famous saying that a Pathan keeps his wife behind seven veils.