I appreciate the reply and I do see you point as incest is a taboo that can turn many potential customers off from purchasing. That is why I only word my criticism as an 'annoyance'. I personally enjoy My Bully is my Lover, it is one of my favorite AVNs. For me, like with everything I enjoy I (personally) have things with it I would think would make it better and merely voiced them in that comment.
Truth is, I believe the main reason roommate / landlady are coded identically as sister / mother is because of the added development time and has nothing to do with Patreon / itchi removing content. The reason I say this is just 'search' the term incest on itchi and you will find a lot of games with explicit incest content.
Having different dialog / renders for sister / mother and roommate / landlady could dramatically increase the word count, which would increase development / testing time. The realistic solution is how MBML (and most other AVNs) implements it and just has a relationship option with identical dialog / renders and calls it a day. For me this observation / criticism isn't exclusive to MBM as I am annoyed, but understanding when it is in any AVN (not just MBML) with this functionality.