As an overweight, bicycling noob I can see both sides to this. Take me for example. I could stand to lose 40 lbs
(It was 50, but thanks to running and cycling 10 of that is gone so far
) How many of you have a mountain bike that weighs 40 pounds? Obviously, the first thing that will help me is to lose the weight.
However, even at my weight and lack of athleticism I can tell that the rear of my Trek bounces around way too much to be safe in corners at much faster speeds than I already go. Full suspension would help, maybe something simple like letting some air out of the rear tire would do the trick. But alas, a good friend of mine that rides semi-professionally, or at least used to, just picked up a new Canondale Lefty which is a hard tail. He is now faster on it than he was his old full suspension.