I've read the last few pages, and I'll give you my opinion. I think, as someone who denied Josy and Maya all the playthroughs, I can be unbiased.
In my playthrough, Josy and Maya's relationship looks very bad. Since the end of episode 6, I don't remember any moments where they interacted well.
Considering you just said you haven't played their route then obviously you haven't seen much of them because of that very factor. If you're on their route, however, there are several examples of good moments with just the 2 of them and also with the MC.
They constantly argue and have secrets from each other.
None of this is really all that unusual or untypical for any relationship. What matters is how you deal with and overcome these things.
Josy clearly thinks more about the MC than about Maya, and she openly admits that she doesn't feel happy.
Firstly, Josy is hyper smitten with the MC and it's primarily motivated by an idealised romance in her head because she looks at this as being an easier relationship with less drama, which it would be. But this is all because of the pressure and dramas of her current relationship that she's projecting this idealism onto him. It's textbook alienation of affection, where someone who feels like they aren't getting much from their current relationship projects feelings onto someone who they think would, but this is not always something that can't be overcome.
This feeling that things are falling apart with Maya is the reason for her unhappiness, not that she's unhappy being with Maya, it's just that it's not going as smoothly as she would like. She's also been holding back a lot of herself and bottling things up because she doesn't want to burden Maya with her issues as she goes through hers and that's not been healthy for her.
Maya is getting closer to Sage, and she seems to be more comfortable with her than with Josy.
Because sometimes it's easier to be with people who aren't part of your dramas. It's why you get the, oftentimes true, stereotype of the Dads who go out to a bar rather than stay at home and deal with the issues there, because it's easier to feel more comfortable and relaxed around others who aren't part of it.
The MC acts as a glue that holds them together. However, this is also a problem. If you need glue, it means that something is broken.
Lately I've taken a different stance on this and I don't think he's glue keeping them together, I think he's like a missing piece in their puzzle, namely that he sort of filled the void that each of them had left in each other when they were forced to be apart. They were missing companionship, affection, and reassurance, all of which he offered, and so he filled that slot for each of them. Their feelings for him have since developed further by being in this relationship, but I feel he's still somewhat occupying that slot, which is why should Josy & Maya get back to where they once were with each other as they said they wanted, he wouldn't simply be a missing piece but a key and equal part of their relationship.
Off-path though, because they don't have that missing piece things are a bit more frayed, but I feel the same applies that finding their way back to each other would have them refill that missing piece with each other.
The MC can do a lot to keep the throuple together, but he cannot make Josy love Maya, and he cannot make Maya love Josy. The moment where they count the number of times the MC has been with each of them is significant. If they trusted each other, they would not care about this.
That wasn't anything to do with lack of trust or like they were trying to compete with each other. They're both a bit drunk and also delirious from the sex and they just start talking about it casually and the MC can even tell them it doesn't matter.
However, I'm not sure if accepting the throuple and ignoring one of the girls is a good idea. It is possible that dally_x is right, and such players will be left alone.
On this, I agree. I feel like it's a trap because when you get in this relationship you're supposed to be getting into it for both of them because that's what this is all about. If the girls realise you prioritised one far more than the other then they may not react well to that, and if they reconcile by default then they may come to the conclusion that his heart wasn't in it for both and he's the one left out in the cold.
If you see it that way, fine. But I think that if they have problems in their relationship without the MC (which is pretty obvious that they do), then those problems won't go away when he's with them. Josy and Maya's feelings for each other are something that the MC can't influence.
Their main problem always was that Patrick found out and it forced them to be apart because of his ultimatum to Maya. That coupled with the stress of dealing with finding a way out of the predicament caused them to drift apart as they focused more on this than each other. With the major obstacle out of the way they can now refocus on each other as they expressed they wanted to do in Ep 11.
it doesn't prove Patrick had already given his ultimatum
It does because it literally lines up with what Maya said,
"He fooled me into co-signing my student loan and afterward he gave me the ultimatum that I couldn't see Josy ever again." So Josy saying,
"Why does this feel exactly like it did before summer?", is because this ultimatum was given before summer and it's what caused their issues.