Why though? Because the greater height difference can allow for huge height on 3-twists and throws, and perhaps greater facility on lifts? Or because you prefer petite girls with tall guys?

For me it's more about how pairs grow together and combine technical skills with engaging artistry. There doesn't have to be a significant height difference between partners for that to happen. There are so many factors involved in well-matched pairs evolving and developing their own unique style that sets them apart from the pack.