since we're talking about incestuous relationships I'm wondering if one day Andy finds out about the Sophia/Dylan relationship I think your chores for Sofia will be much warmer and more open and much more sexual I still don't know if that can happen but it would be interesting 
Uh ... no. There is absolutely no content in DoL that isn't in AWAM. The complete opposite, since there is plenty of content in AWAM that isn't in DoL. You don't even get the option to teach the kids sex ed in DoL, for example
The only walkthrough not being updated at the moment that I'm aware of is mine, because there's no point. With no choices available, and not even any real content, all I'd be doing is changing the version numbers
What if you don't play the Ellie/Dylan path? It doesn't come to this decision that we have to make about whether Ellie forgives Logan or not. What's your story then, how it comes to this ending of Ellie and Sophia?
Updated in the OP.
Well, strictly speaking Update 3 contains Amber Robinson, not Amber Heard. But it's probably also worth noting that this update has nothing for those playing the main Dylan route, since it requires players to have started the Dylan route but send him to boarding school.
Dylan and Ellie get married and have two kids. Then L&P drops this game to start his next one: A Wife and Grandmother.
You are 100% right if we assume that people engaging in any form of incestuous acts will be dumb enough to be hinting or openly displaying their incestuous relationship in public. I mean , I'm pretty sure that if there is people engaging in an incestuous relationship in real life, they would keep it secret and in private, away as possible from the public opinion for many social, moral and legal reasons, but getting back at AWAM's story which is fictional (obviously) and since it's mostly an incest story and if any form of incest sexual act is going to happen, (whether is realistically portrayed or not) needs to happen, or else what's the point of following the story at all ? because I don't know about other fan/followers of the story, but I personally don't care about this story if it doesn't have any full incest sex scenes .
The route continues, that's it.
No idea. There are numerous possibilities as of now for that. Like Logan cheats but He is forgiven by default since we don't have to choose one storyline over the other.
And yet, we're unlikely to ever get any "full incest sex scenes". With all the branches for the Dylan route we currently have, it will takes decades to get to anything serious between Sophia and Dylan, if the game isn't cancelled or abandoned beforehand.
its not about incest, but the problem is the way the scene is portraying. where dylan kisses his sister before her ex-boyfeiends buddies to show that she is his girlfriend. her boyfriend and his buddies should already know who dylan is, who their parents are.
