If only my wife felt this way about my approach to household chores. My point is that in many areas of life, progress alone isn't simply good enough. Even if you believe in the 80-20 rule, progress alone won't get you to that 20%.
I tried to find a deeper insight in the article, but I have a feeling the author gave up with the progress he had made when he decided to publish.
Funny you mention chores because that's exactly what I've always thought of as the prime example of where 80/20 thinking brings benefits. I think a big reason to focus on higher-ROI (80/20) is to reduce friction; I'd rather have a quite-clean living space the majority of the time than a perfectly-clean living space on rare occasion (I think 80/20 thinking leads to a higher average level of cleanliness). You did say 'if only my wife felt this way' so I assume you buy into 80/20 for chores and she doesn't.