He listens to his feedback, particularly from his paying supporters. Calls for granny content are a small minority, and opposed by many. I suspect that while he might not object to granny content, he has no interest in alienating much of his playerbase.Seriously... if you can fuck ugly monster girls like Maghda, then why can't you fuck Mia's mom.
Developer should do it already. Make all the women fuckable.
Also, the game engine is running out of capacity. He's focused on completing the Main storyline, the remaining "open" Side storyline, and filling in certain areas. Plus there's only a few open spots left in the Book of Girls. Those spots will to be occupied first by the girls needed to finish the two storylines. If any open spots are left *and* the engine can handle some more content those spots will almost certainly be filled by girls with more support than a granny.
No shaming over what you like, everyone has their own tastes. But PQ isn't the game to find granny content in.