This is a nice option but a totally different problem. It basically turns incoming calls from strangers into texts. It's for the "millennial" phone user that rarely takes calls and then only from friends. Wouldn't work with FaceTime since there is no mailbox for FaceTime (might be cool if there were though...)

No, the problem here is much simpler. iOS has features for Do Not Disturb as well as blocking spammy callers which both should help here. The problem is they just aren't implemented quite right for this scenario.