I would say the pursuit and journey for happiness is the sweet spot. It's why artists and studios jump right back into some of the hardest processes to go through as they try new things on a new project. After finishing their movie or game, that high of achieving all of those things eventually due down and the question of what happens next settles in.
Like climbing a mountain. Sure all the enjoyment is at the top, but once you learn to enjoy the grand scheme of the whole process, there lies happiness. Anything could happen, but it doesn't quite matter because you're still inspired and driven to climb your mountain.