Weak willpower & procrastination caused by dopamine hypofunction is one of those neurological deficiencies which effort alone can't overcome. Happily, in our transhuman paradise, even the most lethargic spirit can move mountains.
Darwinian evolution has powerfully favoured the growth of ever more diverse, excruciating, but also more adaptive varieties of psychophysical pain. Its sheer nastiness effectively spurs and punishes the living vehicles of genetic replicators.
Here's just one: Even talking about posthuman psychological superhealth is morally frivolous. Another? Promoting superhappiness may lead to what one may call, informally, "inappropriate" behavioural responses.