I agree with you that most of the time mods that add the ability to see additional scenes from the same branch point are usually there to help the player skip unneeded steps or to load a save to try the other branch. The only reasons I can see that Shaddy did it this way were because something in the code prevented him from bypassing the added time, he felt that since you get to raise the Libido of all 3 ladies that it was a fair trade-off, or he simply overlooked it.
I'm sure that the next time
ShaddyModda jumps on here, he'll clarify what's going on. Shaddy's without a doubt one of the best modders on the site but I know he has a lot of games that he helps and mods. He'll get back with us when he can.