As for me in my current thinking, I am generally in agreement with most of post 20, but I would still say that the following excerpt from it ("unfulfilled desires are/cause pain") is overbroad.
- Yes unfulfilled desires are/causes pain
I would be closer to agreeing that "unfulfillable" desires are or cause pain, but I suspect that too would be too overbroad. You might desire to recover from late-stage disease, and that desire would be pleasurable for you as long as you maintain it, even though it might be impossible to achieve. Heck - this even goes for Epicurus' statement in the letter to Menoeceus that it would be better to believe the myths of the gods than to give in to determinism. In that statement he couldn't be saying that the gods would in fact reward the worshiper, and he probably means that the thought of getting the reward would at least be pleasurable for so long as you could maintain the fiction.
Closer yet might be "intoxicating desires" are or cause pain, but even then for the duration of the intoxication that can often be pleasurable (or so I am told!).
Maybe there's no way around the conclusion that only rigorous way to state this is that "painful desires" are in fact the only desires properly labeled as painful.
But that's the question before the house.