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I'm 6'3" and often hover atound 300. Don't do many push ups, but when I do dips, even light sets (just bodyweight), my pecs and triceps feel similar to how they feel after a pretty good bench day.
Relative strength rarely scales proportional to body mass, even in the rare cases that it's mostly muscle. A 5'10" 200# guy at 12% b.f. will generally do more chins and push ups than a 6'5" 300# guy at 12% b.f.
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I agree. Guys have to remember that "body weight" exercises are different than day to day activity unless you have a pretty strenuous day to day routine. Walking around at 300+ lbs doesn't really work your leg muscles that much as your leg bones are actually bearing the majority of the load. Your muscles are mostly just balancing. That is why many people can walk around OK, but ask them to climb a couple of flights of stairs and their legs give out because now the muscles have to support and lift the weight instead of just holding the bones straight.
Upper body is even worse because most people's day to day activity consists of carrying a cup of coffee and a notebook. Doing push ups or dips (correctly) can be a very tough workout! Arms, shoulders and pecks are not meant to support your body weight, much less perform repeated resistance exercises with that weight.
A person can build up to doing multiple sets of push ups, dips etc. every day but it takes time...especially if you start out as a pretty large person because your strength to weight ratio is probably well below average.