I, personally, don't think any of the endings were truly short-changed.
I don't know if Drifty had more complicated stuff planned before the musicopolips derailed everything, but I think what we got was pretty good. I will always wonder what music he had planned though, and if there were any more choices that might have been added.
Still, even at the end of seven, there was the point made that nothing came of the visit to Dad, and none of the paths had THAT much in the way of lewds (what you got wasn't bad though) so I'm not entirely sure the game didn't conclude exactly how it was planned to conclude.
Doesn't mean people have to like it, but I don't think that was the worst writing in the story, and much of it I thought was pretty good.
I do still want to know how they were showing Linda how to do rim jobs though ...