half agree half disagree. It depends on who taught you this lesson. I can teach you that the earth goes round the moon. But of course you wouldn't listen, because i know craps about the solar system.

Although i agree that you should work on your weaknesses, but what if you can do it another way or even a better way? For example, i can't play with my teeth and i can play much faster with a pick or fingerstyle. Should i work on playing with my teeth? After all that is my "weakness". There are many ways to fret a G-chord, which one do you use and why? The way i fret a G-chord depends on which chord i was playing previously and which chord i will play next.

So the best in my opinion is to practice all the ways you can play it (applies to any type of instrument). Both at what you are weak at and what you are strong at. Because the minute u stop practicing what you are strong at, it will soon turn into a weakness. I know it sounds abit cheesy but it's true. I thought it was crap at first too, but quickly realized the limits of fretting/playing only one way.