Here's a question. What if the throuple isn't meant to survive at all?
Regardless of affinity, it seems that you're made to choose between either Josy or Maya throughout the game. This more or less encourages to show favoritism between the two. I think there's even some sex scenes that play out a little differently if you've favored Maya more. Things like choosing to see Josy at the HOTs or watching a movie with Maya, calming Maya down or defending Josy, etc. Which could be implying you won't be able to have your cake and eat it too.
It would also make things a little "smoother" for DPC when it comes to writing the endings for the paths. He probably wants to add in some "We got married and had kids!" type of shit. Which might not necessarily be a "smooth" ending people would be satisfied with if every other Main LI got some kind of similar ending but only Maya and Josy didn't.
As a player it'd also be kind of a bitch and a half to try and "balance out" the character points for both of them for (what looks like) 16 straight episodes. Trying to maintain "neutrality" in terms of Josy favor points and Maya favor points would just be another headache. For me at least.
Of course, it could just be a mechanism that encourages even MORE runs of the same path *sigh* and you can have your Happy Ending Threesome at the very end and DPC does seem obsessed enough to write out all those possible endings. Honestly, I'm just speculating here from what little I can remember.
