Play the game again, and try to pay more attention to it, because there is lots of misconception in this.
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Maya is the Plot , and not Maya revolving around the Plot. And She is not whatever the plots need it to be her. She is a girl, who not even define herself as a lesbian, only just so far she did not have feelings toward guys, and we actually seeing this is a big deal for her when she start developing this toward the MC , Way before Josy arive. And Joining the Hots and everything that comes with it, is all her Decisions, for herself. Because she wants get out from her father's control.
The truth is that we have more than enough information about Maya, She has the most render and the most line, no character is as developed as she is , Everything with Maya is there from the beginning, from the very first episode. Another fact is that, MC and Maya together, is more developed than Josy and MC . If you have a sort off " Solo Maya" path, it's almost beautiful, an actual fucking relationship development, even in episode 5 its actual have more sense to folow Maya, and not Josy. Because of all the history and time that was invested to Maya. No , I respectfully disagree with everything you say. Is quite opposite, Josy is the one who is there for the Maya plot, or for the thruple plot. Visiting Maya in episode 7, bringing her a TV also has more sense, another deeper development between MC and Maya, from past experiences. Maya story could be very much the same without Josy. Control freak father, she wants to break away from, and thats it.
That is why , those who were invested in Maya from the get go, they where more upset with the Josy stuff, because they have to deal with her too when they did not wanted, and not vice versa.