I had a friend who was doing research on communicating in foreign language vs native tongue. While findings are not uniform, his results were indicating that communicating in foreign language makes for a more rational communication. For example, people would not get so emotionally affected by hearing a word with a negative emotional valence in foreign language vs native tongue.
From mainstream see for example this.
DW and I both agree that the fact that we both communicate in English which is not our first language works to our benefit. There is a sort of parity in communication and we also manage to express positive emotions to each other all right.
I for sure notice that when I talk to people in my native tongue I can have a hard time focusing on the message and instead focus on the way people speak.
Our families do not speak English very much, and us being moderators in communication with them can have benefits as well. Also, it is then possible to just smile and earn in-law points this way
