Yes, the parallel development of white and black characters is a waste of time. I said this in the Patreon feeds too, that rather than chop of the game the dev should concentrate on one character and stick with it to save time and resources. Black or white doesn't matter to me.
As for making this game into a VN, you really can't with the existing material. The game was designed as a sandbox game with these game elements being played in parallel rather than sequentially, and for the gym and office paths to be followed independently and in parallel as well. The dev is trying to use elements that were never planned to be used sequentially and turn it into a cohesive story. It doesn't work. The story makes no sense that way and the rather lame new linkages he is using to try to connect those elements sequentially makes the story writing look weak. When I said this to the dev in Patreon he came back and said he was frustrated by the process too, and that it affected his ambitions, but, as you said, it was going to make the game development easier, faster, and commercially viable quicker. What it wasn't going to do is make the game better. He is selling out the original vision to try to make it an easy to develop VN. He thought it would be quicker. Well, here we are a year later and it's not developing faster. It's not developing at all and it's STILL not into new story material. It would have been easier to stay the original course, shorten up the overall storyline, and then wrap up the game and move to a VN project that would have made sense. As it is the superpower and skills development portions of the game might as well not be there.
I had so much fun with this game initially, and then I just had to bail because it degraded by about 80% with the transition.