Everything IS true. What isnt true is how much important is // or what is the different forms of power. Bodybuilder vs kickboxer vs strongman vs special forces vs sprinter vs marathon runner etc. There are many ways in which you can stress/workout your muscles, no sprinter can walk with as much weight / distance as soldier, no strongman can survive in the ring WHILE delivering power for 1minute and no kickboxer can pull a train. Its different kinds of stress, yes. But your body WILL look the same, your body's DEFINITION will be different. Genetics DO apply in body types, not in body weights.