80% Perfection == happiness???

Scot Adam writes in his blog about how perfection relates to happiness. While, I agree with what he says overall in this post, I disagree with this statement: "Once you achieve about 80% rightness, any extra effort is rarely worth the effort"

Yes and no. In the context of work, I can see product development groups going the extra mile for that last 20%. R&D more than happy to stop at 80% considering the diminishing returns.
Just because the last 20% of the work takes up equal amount of effort as the 1st 80%, does not mean it is not worth doing it. Many a times, that last 20% is what makes the 1st 80% useful, accessible, reliable.

Does not mean everyone should aim for 100% perfection. It is a question of optimal RoI and making the best use of one's time and energy. Lot of the times, the last 20% is not fun, boring, routine. I hate doing that 20%.