It's just the nature of it, really - "satisfaction," to me, implies something that completes you, in a way that you wouldn't have been complete if you didn't have whatever brings it to you. It's a long-term sense of fulfillment, basically. Not happiness, but contentment with one's life, which is arguably the better goal.
Happiness, on the other hand, is something best found in fleeting things. It's not something we're meant to have for a long period of time, and assuming that we will is just setting ourselves up for disappointment. That isn't to say I think life is inherently depressing! It shouldn't be that, either. But I think it's better to accept that we'll find happiness in temporary things, because all things are temporary by their very nature - nothing is eternal, so why try to find our happiness in something that doesn't exist?
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Happiness, on the other hand, is something best found in fleeting things. It's not something we're meant to have for a long period of time, and assuming that we will is just setting ourselves up for disappointment. That isn't to say I think life is inherently depressing! It shouldn't be that, either. But I think it's better to accept that we'll find happiness in temporary things, because all things are temporary by their very nature - nothing is eternal, so why try to find our happiness in something that doesn't exist?