Anecdotally. Previously 'most' applicants who filed 90 days early without strictly meeting the 3 years marital union requirement seemed to somehow get away with it, and a very small handful seemed to get denied for it. But, in just the last month I have seen multiple reports of denials based on just that reason and at least one person who stated that they were directly told at their interview that there was an internal policy change to maximum enforcement, no exceptions and 100% denials if the 3 year marital union requirement was not strictly met. (so says Reddit and Facebook groups). Based on that, and general news lately, today I certainly would not try filing early if the 3 year marital union requirement was not met. It seems times may have changed.