I personally think he tried to overhaul the entire game (for maybe like the 3rd time) in Chapter 4 but lost direction/interest/passion or maybe just couldn't accomplish the task from a technical point, so he just decided to end it and start fresh in the next project.I agree with some of the things here, not with all of them. But you have several good points.
The incest thing, you are right, there couldn't been any incest because of patreon, even if you have a thresome with Emily and Chloe is more like a one time thing.
The MC was doing anythin in any way with anyone. Kind of true, there wasn't a lot more to explore, it was time to give it an ending, but i also explain in another post how it could have been and why that the past update and this one are a rushed ending, because in-game nothing told you "this is the end of the journey" it just happend.
"they were some characters with whom the discipline had to be stopped" True, but episode 3 show you the alternative with Emily. You can keep the discipline with and just get rid of the spanking and pain as punishment, at least for Chloe(that consider it a reward), and Emily and Amy that don't need it to "punish" them. You could keep it for Rachel, but as we see, the doesn't matter anymore.
"Again, storywise, how can you imagine that a woman who repeatedly said she was in love with her husband, in her own way and within the love triangle with Susan, how can you think that she'd marry MC just 6 months after her husband died?"
The dead of his husband is part of what came out of nowhere, and one of my problems with the past update. That she'll marry the MC?, YES, but i'll tell you about that in a moment.
"See them storywise. Chapter 3 was about MC proving that he could act like the man of the house, through discipline. He did that. Chapter 4 was about proving his Uncle that he could replace him in his job" True, but this does come with something i notice whe i started playing every chapter once more a few days ago.
In every phone call you have with him you uncle insist that you get with Rachel, that you replace him with her, that you take his place, and he doesn't mean just his job or a temporary thing. He wants you to be with Rachel after he is gone... that ending doesn't exist.
Now the problema that i have that can be fixed or that i could have been fixed.
"No more 'Master' when back on the yacht? Yes, maybe. She's with Susan now, another dom who might not like that too much when out of the particular island atmosphere. And it's a way also to show that a page has been turned. Rachel steps back to leave MC with one of her daughters."
The part "Rachel steps back to leave MC with one of her daughters." it's kind of ok. Again, it came the past update, it wasn't something like a conversation with Rachel about how he would marry one of her daughter and their relationship would have to stop or at leat slow down, that would have been nice.
"No more 'Master' when back on the yacht? Yes, maybe. She's with Susan now, another dom who might not like that too much when out of the particular island atmosphere" The problem is that they say it in the fucking island. That Rachel WANTS to keep the Master-Miss with MC and Susan in the Yatch. The MC thinks it's a bad idea, Rachel WANTS to do it, and without Emily or Chloe close, Susan wouldn't have any problem with that.
The game couldn't go on forever and i needed to end?, YES. But as i say, one upate everything is alright and the end is nowhere to be seen and the next one "Chose one, the game ends next update and one of the Main girls in the first 3 Episodes is not one option, this other girls that was a "side" girl since she came is the other option" it's not a good way to end any game.
As i say, if you never liked or were never a fan of Rachel and loved Emily or Chloe since the begging it probably be a "good" ending for you, it wasn't nor a good not a satisfactory ending for me. And again, it could have been a lot better with more that one update to chose and accept that you'll marry one of them
And the Marriage thing really came out of nowhere. In no other update there was a mention of that. It's just a rushed ending for a game that was my favorite, and now is a game that i can't think bout without the word disappointment.
The marriage thing mostly works with Emily (because she's clearly in love with MC) and Amy (because it's ultimately her goal from the beginning), but Chloe one is kinda weird. Besides he's fucking all of them anyway so it makes very little difference.
Again, another four or five updates would've made this a better game, but I'm happy with it as is. Other games like freeloading family, personal trainer, and many have much worse and anticlimactic endings. At least in this one there's an opportunity it'll be revisited in the future.