Finishing, as in will power, focus, and vision, is like a muscle that you can take to the gym.
This advice is the equivalent of going for a run one day and never picking up the habit. I don't think it will lead to fitness.
> You can be finished with your project whenever you decide to be done with it. And "done" can mean anything you want it to be. Whose standards of completion or perfection are you holding yourself to anyway? Forget about those! Something is done when you say it is. When it's no longer interesting. When you've gotten a sufficient amount of entertainment and experience from it. When you've learned enough from it. Whatever, whenever. Done is what you say it is.
If you already say the goal is fitness, you're not doing SOFA. The whole point is to accrue experience, experiment, discover, not a predefined state. You don't SOFA a specific sport to lose weight, you SOFA when you want to find a sport you like enough that you will be able to do it regularly.