The power-to-weight ratio is important to the sports requiring locomotion; the cyclist that generates 400 watts of power with a 145-pound frame is more efficient than the cyclist that creates the same force with a 180-pound body. The 200-meter runner who can deadlift 3x bodyweight runs faster than the sprinter who can only deadlift 2x bodyweight. The runner's size/weight does not determine the one-rep max instead it is the neurological pathways and ability to recruit a greater percentage of existing muscle that are decisive factors. Because of this an athlete may develop the ability to generate incredible power without significant size or weight increase - by simply making the appropriate neurological pathways more efficient.
Relative strength can also determine how individuals integrate into a team. In the military context, every soldier wants to be strong and in an effort to become strong many get big as well. So how does the 230-pound guy integrate into the team? He's strong enough to hump heavy loads all day or carry a casualty. But what if he gets shot or sprains an ankle and his teammates have to carry him, and his gear? This same issue affects mountain climbers and backcountry skiers who often operate in remote areas and must be 100% self-sufficient, fire fighters, SWAT cops, etc. To be sure, fitness is an individual concept but each individual's fitness, size and speed can make the team more capable and flexible or less so.
So size matters, but bigger is not necessarily better, nor is bigger always stronger.
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