This may seem like an odd requirement but it's done for good reason. The feature is rather simple as it allows the MC to convince ANY married female to divorce their husband. So to make this more believable, the MC has to be a huge catch - high reputation, good looking, successful, with a mansion. The feature could be made more random with some wives refusing but the feature is made up of very little code. Since it's currently a 100% success rate, the MC needs to have made a name for themselves and be quite the catch or eligible bachelor. So until you reach a high level of success you can't just convince all married women to divorce their husbands.
Some players like to question everything we do (and I'm not implying that you are) but there's usually a good reason why we do things a certain way.