I'm heavily invested in M&J, and because of that I can't really bring myself to do solo routes for the other girls since it means rejecting them. But so far, the Neutral manwhore route has given me most of the content I really care about, with the exception of the Quinn scene in Ep 6 which was unfortunately locked out of that route.
Overall though, I'm hoping that the MC will be able to do this for as long as possible because the idea of having to lock yourself in to one relationship for a large portion of the game otherwise it won't work out with them if you're still manwhoring is not an appealing prospect in terms of having to limit the amount of content you get per episode on a solo run. Sure, multiple solo runs can unlock all the content, but being able to unlock a large chunk of it with just one run makes things so much easier and manageable.
Besides, the MC is technically just dating these girls and that could theoretically go on for several in-game months before any of them try to lock down a committment, and even then, not all of them might want to given the nature of their relationships.
- With Sage, she's graduating after this current year and so might not want to start a committed relationship with someone who's just starting college as she's about to leave.
- With Bella, she's a teacher and technically still married, and so can't really have an open relationship with a student.
- With Maya and Josy, a relationship with the 2 of them out in the open would be a pretty big deal and they'd have to sort out the situation with Maya's Dad before they would feel free enough to do it. Separately, an open relationship with either would mean one girl has to likely dump the other and then the dumped one will see her ex with her other crush, and that seems like something they wouldn't want to put the other one through.
- Jill's the only LI for whom a committed relationship seems the most uncomplicated, but even with her you could probably continue to date her whilst you date others and be OK until the time comes where you have to choose, which hopefully won't be until near the end.
In the end, all LIs will undoubtedly get endings with the MC in some way or another, this is just my reasoning for why I think these relationships aren't necessarily going to reach a committment stage during the course of the game and he could have some latitude to date them freely.
Yeah, right now I just want to see how far how I can go playing the field. If it blows up in my face, well then that's when new routes will have to be made, but right now I don't feel the need.