Success imho is the art of not fucking up any single aspect of what you're doing, plus doing some aspect really well. You can have a "lifestyle" (meaning you do pretty well, but not exceptional) job/business/... by simply not fucking up any of it.
Grit is like this : fuck it up and you're dead in the water, but you'll be fine at "normal" grit if you excel somewhere else. Exceptional grit is useless, counterproductive even, when for example market fit is not there at all. Or when the required knowledge simply isn't there.
The one exception I've seen in practice is that on rare occasions a particular combination of skills was a necessity to achieve exceptional success. But it sort of looks like equivalent to winning the lottery. It's never an obvious combination of skills that works like this, it's something stupid that you wouldn't normally combine, and that's exactly why it works. But there are a huge number of possible combinations, most are not worth anything exceptional.
Grit is like this : fuck it up and you're dead in the water, but you'll be fine at "normal" grit if you excel somewhere else. Exceptional grit is useless, counterproductive even, when for example market fit is not there at all. Or when the required knowledge simply isn't there.
The one exception I've seen in practice is that on rare occasions a particular combination of skills was a necessity to achieve exceptional success. But it sort of looks like equivalent to winning the lottery. It's never an obvious combination of skills that works like this, it's something stupid that you wouldn't normally combine, and that's exactly why it works. But there are a huge number of possible combinations, most are not worth anything exceptional.