The devs been quite clear, he has a story in mind and a goal in place, I can't be bothered going to search, but he's mentioned in the past, the stages Laura and our MC are going to traverse. So yes there may be a lot of the same old old same old and then teases that ultimately lead to nothing, but we are setting up something bigger here.
I think you are correct.
About the game being "stagnant": it may be true but LeStag explained both "he has a story in mind and a goal in place" but also he has not planned or written many chapters in advance.
So yes, sometimes with updates every three weeks, maybe he needs to write one chapter of lesser importance - not canon to the story - so that he can spare time for the writing of more critical upcoming chapters that need more work.
Being a little disappointed here and there by an update is normal and not concerning at all.
I for one keep in mind that this game was released here exactly 8 months ago. Anybody discovering the game now will enjoy it and playing it from chapter 1 to 30 means a several hours playthrough. Netorase Phone has MUCH content for an 8 months old game!
I am on board with the story, the characters, the pace, the art and the amount of art, and 100% onboard with the "healthy relationship" plan of the dev. I like both NTS and NTR. I understand this game is NTS and if I want a fix of NTR guess what? PLENTY OF NTR GOOD SHIT AROUND HERE.
About branches: I fully understand that "choices should matter much" is irrelevant because it multiplies the required amount of work (writing, art, coding) and that would SLOW THE STORY.
If I should point something I'd like to "improve" - it's not about NTS / NTR shit or Branches. It's about the following:
in this game, every girl at this point has a pretty distinct personnality, her own dialogue style and a really unique physique. On the contrary, the men Laura is fooling around with are a bit too much look-alike physically [understandable at some point - Laura may like a certain kind of men, and I think Nathan and Oliver look good - yet it's not ideal in a story like this]; and also, if not in personnalities (Nathan being more friendly/likeable, less dominant than Nathan for example), it's like there is also something too similar in... the way they talk and / or the pacing of their dialogues. It's not easy to pinpoint what exactly bugs me but at this point non-MC male characters need stronger identities.
Yet, this point CAN be improved, they just need a few chapters to be fleshed out... I'm confident with LeStag.