The girls from the magazine were in the game from the start. It was always hinted that they would arrive at some point.
Sam's sister and the Cafeteria pair
are needed for the plot. Just like we had to work on the teachers before we could really get into the students, and why Debbie needed to be one of the first.
Many of those girls have gotten exactly that, a tiny bit. It's generally one girl per update, but there is usually a bit of something for others. Between that and the main plot, it takes a while to get to everyone. And they did more of that this time, by taking longer to work in parts for Harriette and Charlotte this time. It might not be the girl you want, but that is exactly what you said you wanted in general.
You don't have to agree with it, but that is how many games are made. The devs say 'these are your options, vote', and the ability is vote is one of the rewards. Runey makes sure to have one event for each main girl every update, and people complain about that too "my favorite girl, doesn't get enough attention". You do fast updates, people are mad there isn't enough content, or that people get left out. You make big ones and they complain that you take too long. Try to find a balance and you get both...
My favorite got cut off at the knees, before it even began, just barely a taste and then passed over for the one I dislike most. We all get sad when our favorites get overlooked, or when the ones we don't like get focused on, that is the nature of the business. They can't help who is popular or not.
Cool, glad to hear it.