Ehh, that's basically hyperbolic bullshit. There's multiple other characters Sophia can engage with, including ones that blackmail her into said engagements.
I mean yes, incest is pretty central in the game (shocking and surprising, with the game from the very title making big deal out of protagonist being a mother, i know) but it's far from all there is to it.
There's a way to largely avoid the incest in Part 1 & that's what I did for quite a while but there's no specific opt out. It's not like Dylan got signed by a top European football club & left home, (with an actual job), to go & live the dream. (He would still have had home visits, of course). I suggested this years ago. Pirates don't count for anything with the Dev, as we know but I thought he might just have 'come up with a similar idea' himself. My suggestion would have been a lot better than a visit from the Mafia, which was the Dev's response to the continual complaining from the anti-blackmail lobby. This, in itself, showed at least some attention being paid to feedback, those several years ago. Unlike the anti-blackmail lobbyists, I not only recognised that incest was an integral part of the game but didn't whine, white knight & kink-shame to try to have it removed, even if I'd thought it might work.
There's no logical reason why a game or story with the word "mother" in the title HAS to be about incest. 3D teenage game culture has made it what it is, because let's be up-front, incest is a mainly teenaged fetish. Older people know that it isn't really "the ultimate taboo," while those with kids of their own are unlikely to count it amongst their favourite kinks. (Unless they're practicing this in the privacy..... etc.). Other story-telling genres & the mass media have no issue with the word whatsoever. As the current M/S incest story related in AWAM, pushes Dylan as the more mature of the pair, who despite being a virgin, will no doubt one day send his mother into orbit, as she virtually transcends this Earth in sexual ecstacy, I have to assume that not only does the Dev not understand sexual situations, how they arise & are resolved but that he is catering primarily for teenage fantasy wish fulfilment. When that will actually occur is anyone's guess.
We've already had the, 'so much bigger than his father' & 'how can this be wrong, when it feels so right' average/below average porn stuff, so unless Dylan manages to get in a lot of sexual experience with someone else, AWAM will continue to show Sophia as a 2-dimensional object for her son to practice on. Her intelligence & personality have shrunk, almost corresponding with the several inflations of her now disproportionate breasts, as indicators of the predominance of Dylan as the 'real' MC, with Sophia as 'MC stereotype.'