It is widely acknowledged that, all things being equal, the heavier of two fighters will have an advantage. As such, it would seem that many martial arts would be wise to include exercise and dietary methods to develop the bodyweight of the fighter as well as developing the fighter's technical ability.
Obviously modern weight training methods address this issue (although some people are more receptive to these methods than others). Does anyone have anything from the internal arts, or personal experience, or other martial arts backgrounds to offer regarding this?

I think too many martial artists are either scared of becoming "muscle bound" or lack the genetic potential to be big and strong (or are too wimpy ). Also, you have to rememeber, common bodybuilding programs build mostly extra fluff in the muscles and have small impact on the strength to bodyweight ratio. Powerlifters are much stronger for their size and the muscle built by them is much denser and functional.

I weigh 174 lbs at 6' tall and 16 years old. However, I presumably will become considerably more muscular as my body reaches full maturity, even my heart is still smaller than it will be when it matures at around 18 years old. (men also become naturally stronger as their muscles continue to develop into their thirties, that is why men are often 35-45 at the Met-Rx world's strongest man competition)

My old tang soo do/TKD instructor a 8th degree blackbelt and former muay thai kickboxer was 6'3" 200 something lbs. He didn't like weight training, said it made you slow. However, he was Korean and most asian's think weight training is to quote the Water Boy, "weight training is THE DEVIL." Actually, modern science shows that weight training can make you faster.

many competitive martial arts are broken into weight classes in an attempt to negate this inherent advantage. Thusly if you are a competitive fighter, you must be as strong as you can be for your weight. Again this easily addressed by Resistance Training. The point: weights are good.

weight means nothing if you have the necessary skill. the bigger they are the harder they fall.
(lets just forget about how hard it is to take them down) if you can "listen" to your opponents weight shifting, you can anticipate his attacks, my strategy against a big guy is to counter attack quickly and effectively. avoid frontal confrontation, rather, feign it.

What do you weigh? If it's less than 165lbs i'd like to test your theory!
though i must admit, I have fallen very hard in the past...