I completely disagree. If you never use straps, you should never need them. I've never used them, and my grip is phenominal. I easily deadlift arounf 550lbs for sets of 5, and have pulled over 600 for a single, all with absolutely no signs of grip failure. I even lock out with the weight for 20-30 seconds at the end of the set, and still have no problem with grip.
The best part is that I NEVER train forearms outside of the work they get from heavy deads, and they are probably my strongest bodypart.
Straps are a crutch, same as belts, wraps etc, and personally I dont see the point of relying on a crutch that will cause a weakness to get worse