Bastoche, thanks for the summary. I think that's a lot better than having super-long posts.
In any case, going over it, one thing jumped out at me (which I had previously forgotten).
Currently, soft-focus rules do not allow the use of Carnal Arts or Techniques.
Now, a group is playing with hard-focus rules (HF), but decides to have a soft-focus (SF) encounter. Character X has two Carnal Arts, lots of ranks in Prowess and a great number of techniques and kinks/frets. However, none of these matter for his SF gratification roll, except for his Prowess ranks. Even when simplified into a single roll, in a given encounter, he should be able to employ some of the things he's learned to his (or his partner's) benefit.
A different group is not using HF rules, but a few of the characters are frequently using sex for both pleasure and to further the game itself (using sex to get information, etc.). To that end they took a PrC from the GUCK. However, since they are not planning on using HF, the prerequisite of a Carnal Art, or kink, or other HF rule will not let them take it, even though it would be a perfect fit for their characters (unless of course they have no problem wasting a feat slot on a feat they will never use).
I could provide you with a lot of other examples, but I think the point becomes clear: both SF and HF rules need to be compatible enough to allow for seamless integration with the rest of the material. Having SF-only and HF-only will make things cumbersome, and the overall quality will suffer accordingly.
I don't mean to be a pest about this issue, but there has to be a way to mesh SF and HF to allow seamless integration. For your average Jack and Jill (no carnal arts, no kinks, no frets, a few ranks in Prowess), the current SF rules work fine. However, SF stops working all that well once you deal with adventurers with a slight sexual bent or NPC sex professionals who might even have a carnal art, even though they are lower-level.
Before I start rambling on, am I the only one who sees it this way? I am not saying that we should get rid of HF or switch the focus of the book. I simply want to give more options to the SF games out there. I think we all agree that the majority of people who d/l the GUCK will stick to SF games.