... can achieve 50m free times in the 30s range by "muscling" our way through it while the same inefficient effort can't be extended out to the 200m range? That inefficient technique will result in bigger drop offs as distance increases...
Isn't the opposite more likely to be true? Resistance in the water increases exponentially with speed: greater speed means exponentially greater resistance.
... can achieve 50m free times in the 30s range by "muscling" our way through it while the same inefficient effort can't be extended out to the 200m range? That inefficient technique will result in bigger drop offs as distance increases...
Isn't the opposite more likely to be true? Resistance in the water increases exponentially with speed: greater speed means exponentially greater resistance.