Damn man, it sure looks bad. So they are doing kind of a Dr Bones?
Not really. A very short summary of what's gone wrong would be:
The first 3 years were probably the worst for content being released with a single main scene. The project lead at the time ended up getting replaced as a lot of people complained about the confusing Quests and slow release of content.
The replacement lead did a lot better moving the story forward and getting a main scene added roughly every 6 months.
After a couple of years he stepped down due to other commitments. At that stage the plot had been split in 2 as the developers decided the original story needed to be binned. The next lead who came in took over when the old plot was being replaced. And the last couple of years have been focusing more on phasing out the original plot and replacing it with the new.
This hasn't gone down well with some members of this site. As a lot of the lewd scenes for the last couple of years have focused more on side characters rather then the main girls.
To be fair. It'd be hard to add meaningful stuff to the main girls as the work being done concentrates on before you've corrupted any of them.
The next release which is due in the next month should be the release to return the game to a single story. Rather then the messy old plot/new plot that is currently there.