I think the chapter is still just ok but yeah it definitely dropped the ball. I think if this was the final chapter instead of doing one more chapter than chapter 3 would've been pretty good.
Chapter 3 was lack luster to many.
IMO the writers tried to play to two very divergence groups the D only and D sharing paths.
Chapter 3 was very much D becoming more self-confident and sexually active. That works well in a sharing path but is limited in a D only path. Splitting the time resulted in a Chapter that meandered without any clear focus.
Again the D only path should have ended when D and F left their old lives behind at the end of Chapter 2.
Chapter 3 could then have focused on D becoming more adventurous. Without a cacophony of voices demanding a D monogamous path where every update is fresh and exciting while not adding anyone to their sex life (or only including a select few) the team would have been free to devote the update to develop D's new sexual appetites.