First of all, I think some here should realize that AWAM is not a game about Sophia alone, but a game about Sophia in her role as "A wife and mother". Nowhere does this title specify that all scenes must be depicted from Sophia's perspective.
Telling a story from multiple perspectives is an often-used device. One example is maybe "The Godfather" were not all the scenes in this movie are told from just one perspective. Like in AWAM also in this movie it is not just about one charakter, but about the construct and dynamics in this family. The change of perspective is necessary to show the development of other characters and thus give depth to the story.
Incredibly, I think there are elements of agreement here. I never believed that the story was going to be a detailed daily diary of what Sophia got up to. Indeed, there were characters that seemed to have great potential in what they might do, as well as in their inter-actions with Sophia. Most have been discarded, written out, forgotten about, or placed in limbo for indefinite periods but certainly for years at a time, e.g. Bennett, Alyssa, Aiden, Nathalie & there are many more.
My point is that there was no need to make Dylan an official "2nd MC" because he was already prominent throughout the story. His elevation to official lead status & the reduction of Sophia to what used to be termed, his "leading lady," (a supporting role, however important), transformed AWAM into the average teen porn that it now resembles. That is, it would be average teen porn if there was any penetrative sex. It would also need to be faster paced to fully qualify. Story-wise, IMO, it's debatable whether it's even average but the high quality renders bring it up to this level.
This 'Dylanisation' wasn't done to tell a great erotic story of a woman's cheating & corruption in VN form but to please a youthful core audience of paying Patrons, many of whom, presumably, identify with the teenage virgin schoolboy, in some way. So far the writing in Part Two is not worthy of the occasional high standard that the Dev proved capable of achieving in Part One.
What other reasons could exist for the departure from the original concept outlined in the promo blurb? Simplification could be one. Having a woman as MC while writing as a man, [L&P is male ... end of], was always going to be difficult. There's also the lack of plot-lines for a mature woman, (other than the stupidest of porn fictions), which could be readily adapted without a huge effort. Dylan, on the other hand provides a wealth of well-trodden scenarios from which to draw, with the upcoming teen party being one example. Acting tough while remaining seated on his first visit to a night-club with 2 potential opponents, beating up hobos in the park after one martial arts lesson, with 4 drunken, nothing-to-lose, potential opponents, etc., have also endowed him with frankly, ridiculous super-powers, which even many confident teenagers do not possess, let alone the shrinking violet of Part One, who found it difficult to get a girlfriend & needed his Mammy to tell him about girls & sex. It's all about schoolboy wish fulfilment. That needn't have been an issue but in practice it's left no room for anything else. Dylan is the real MC of a simplified story of teen porn & with a large supporting cast of other teenagers.
Now of course AWAM needs to appeal to teens, I understand that. It's a fact I was a teenager myself for 7, not always easy, years. It's also a fact that AWAM originally attracted a wider audience than this, an audience which has been ignored during Part Two.
You mention "The Godfather" & I agree that this was an example of excellent story-telling. It's one of my all-time favourite films & I've seen it numerous times. Audiences experience the activities & POVs of Michael, Santino, Tom etc., all without the need to make any one of them an official 2nd MC. Imagine an intermission in the cinema where it was announced that a particular character was now a "2nd MC," 'for your viewing pleasure.' It wouldn't have worked.
Speaking of which, imagine also a vociferous lobby who were into nasophilia & wanted Don Corleone's nose to grow 2 or 3 inches. [There are & have been whole cultures for whom the nose had sexual connotations, e.g. Ancient Rome]. Part Two of the movie would then have been shown with a 2nd MC & a newly mutated Don, just like Dylan plus Sophia & her ever-growing "milk jugs."