I think I understand what you mean. I think people can be in a good faith marriage when not living together. Basically the paperwork does not need to be done ASAP. The marriage was entered in good faith but does not become "not in good faith" the minute you separate but stay married. There are multiple reasons for people to not file the paperwork immediately, laziness, mental burden, potential asset/custody fight, unwillingness of one party, etc...Applying to something as "married" after a separation but still married would be "not in good faith". I think that is what you are implying I would be doing here. I don't know if you are right, it's all just semantic really. If we were to apply for mortgage today and say that we are married while we are in fact separated and living in different addresses I would agree that some kind of "fraud" is happening. But applying for a joint I-751 while separated but still married is the only thing I can do. Now would they still see it as "fraud" because when I filed the I-751 we were separated? Maybe. Seems harsh though. If that is the case then I guess the route would be to get divorced before applying (to avoid needing to amend).