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.
Eugeroic = “good arousal." Unique class of drugs (adrafinil, modafinil). Like adaptogens (ginseng), only “stimulate when stimulation is required.” Highs and lows associated with other stimulants (amphetamine, etc) are absent with eugeroics.