HOT TOPIC TUESDAY: 80/20 rule is it offensive?

If you've seen Tyler Perry's movie, "Why did I get married?" Then I'll assume that you've heard of the 80/20 rule, just in case you haven't, here's the explanation;

This basically means that in marriages, you only gonna get 80% of what you need. Now when things are down in a relationship, you seen this attractive  man/woman that offers you the other 20% you want, that you feel is missing in your life. So then you're faced with a problem, should you leave the 80% which is your current relationship thinking you gonna get something better and you end up with only 20%.

Ok, now that we've explained that, I feel this rule is a good example of showing someone to appreciate what they have, but I also have a problem with it.

How would you feel if your husband feels you're only giving him 80% of what he needs, and you've been giving him 100%?  What if your husband can't explain to you what 20% he's missing, how do you handle that?