That seems like a fatuous point to me. The productive mindset is not about satisfaction, it’s about striving. Who suggested you’ll feel more satisfied by spending more time striving? And why is ‘feeling satisfied’ assumed to be a general goal anyway? For me satisfaction is just one emotional state, one that I want to experience sometimes but not as often as a feeling of striving and achievement. For someone else it might be the other way round, and that’s fine too. There is no need to declare what “actually matters” as if you speak for everyone.