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What? That sounds like Alice in wonderland.

Sure a manager can affect performance but ultimately it's down to the individual.

And happiness is all nice and good but if work is the only thing that affects your happiness then you have some deep self-discovery urgently pending.

This is going too far the other direction. Even if we assume no one is just slacking (which is a bad assumption), sometimes people are just not suited to the job they're in, and there's nothing a manager can reasonably do to change that, short of removing them.

Oh you're one of those people who thinks other people are the cause of one's own happiness? Or lack thereof? Geesh. Your emotions are entirely your own responsibility. Full stop.