The reason might be not cluelessness, bad attitude, rigid thinking or bad marketing, but the hidden costs of your suggestions. Many migrants tend to spend an inordinate amount of time, during the first months, thinking about how they might be perceived, often playing pointless guessing games. For example: having two different names is an additional source of confusion, and a constant reminder of "otherness". These costs have to be balanced against the perceived benefits. Sometimes they are worth it, often times not.
Focusing on improving communication skills is different because the cost is time, effort and perhaps money, but there are no negative side effects.
Focusing on improving communication skills is different because the cost is time, effort and perhaps money, but there are no negative side effects.