To me perfect is the enemy of good is: you don’t arrive at good, because you set unrealistic goals for example. But theoretically you all want to go in the same direction.
All or nothing is taking chances, gambling. It’s a different category. It doesn’t have to do anything with one solution being good or bad. It’s saying I want that, no compromises. Like if you say ‘I want to go to Disneyland or I’m not coming with you.’ There’s not necessarily anything good or perfect or bad in it. With political parties it’s often they have to show their voters they’re determined and not taking shit. So they say ‘we’re not compromising’. And that way you have a clear winner and loser. Can be beneficial or detrimental to a goal. The motivation could be entirely different. But both things can also be at play at the same time.