This assumes every task will get done better/faster if you give it 100% of your attention and therefore "it is good enough to give it 100% of your attention" must be equal to "you are going to give it 100% of your attention".
A matchmaking screen, loading screen, unskippable cutscene you've already seen multiple times, orbital maneuver you have to wait for, game event you're waiting for like enough currency or materials to start your next project, and so on do not follow this assumption. In many cases these parts of the game actually get worse if you give them 100% of your attention.
I find Marvel movies in particular are better if I watch them somewhere I can use my phone or chat with people whenever I like. They're worse in the theater where I don't have anything to do but pay attention the entire time. They don't really reward close watching and the not-very-good nearly-all-CG action sequences tend to bore me at times.
A matchmaking screen, loading screen, unskippable cutscene you've already seen multiple times, orbital maneuver you have to wait for, game event you're waiting for like enough currency or materials to start your next project, and so on do not follow this assumption. In many cases these parts of the game actually get worse if you give them 100% of your attention.