Hypothetical (and I may expand on this in another post):

You've been shot. Fortunately, there's a well-equipped doctor on hand who can remove the bullet and stitch you up. Unfortunately, he's got everything he needs except any kind of pain killer. The only effect of the painkiller is going to be on your (subjective) experience of pain.

He can say: A. Look, I don't have painkiller, but I'm going to have to operate anyhow.

B. He can take some opaque, saline (or otherwise totally inert) IV, tell you it's morphine, and administer it to you.

Which do you prefer he does? Knowing what I know about the placebo effect, I'd have to admit I'd rather be deceived. Is this unwise? Why?

Admittedly, I haven't attained a false conclusion via my epistemology. It's probably wise to generally trust doctors when they tell you what they're administering. So it seems possible to want to have false belief, even while wanting to maintain efficient epistemology. This might not generalize to Pjeby's various theories, but it seems that we can think of at least one case where we would desire having a false belief. Admittedly, this might not be a decision we could make, i.e. "Lie to me about what's in that IV!" might not help. (Though there is some evidence of placebos working even when people were made fully aware they were placebos.)

On the other hand, I'm not sure I can think of an example of where we desire to have a belief that we know to be false, which may be the real issue.