Of course they have a direction they want us to go, in those games the choices we make are mostly superficial, i would be impossible to make 10 different games to follow each fondamentaly different path.
Saying it's impossible is incorrect. A perfect example is Sisterly Lust. There are a number of possible endings (I believe it may even exceed 10) depending on what choices you make (from 1 to 17 girls and pregnancy options for 4). Granted it's not the Love/Lust options but it depends on how much time and effort a Dev team is willing to put into the game. There's also the design. If it's storyboarded properly, they have all that stuff plotted out and ready to address. These Devs are interested in getting something out for their Patrons, but unfortunately they're being kind of sloppy and not ensuring newly placed content is consistent with old content (previous Daphne events, Barbara events, and now Lori events).
I agree that 90% of the game is the same material regardless of which route you choose (I'd probably say closer to 95%), and you're correct that there is a direction they are sending us, after all it is an AVN. But saying it's impossible is like saying it's true because you saw it on the Internet. They can do it, but they just aren't. I get it. It would require them to design two or three updates ahead, ensure their storyboard is consistent and run through/test every update for consistency. This would result in not meeting the turn around times that they've published and run afoul of their Patrons. Time=Money. Patrons aren't usually patient, so timeframes are short and simple so they can deliver a product and keep the people fappy.
I used the Scrappy Mod up until version .09. I had versioning problems in .085 and .09, so when .095 came along I started over and ditched the mods. I run multiple games now, one based on Love and the other on Lust just so I don't miss a scene. Unfortunately the Devs are now hard coding routes in, so my numbers are getting mixed. Again, I get it. This is their story, they can tell it the way they want, and I'll sit back enjoy the ride. I just wish they were a little bit more consistent.