Many excellent pro ladies are not teeny tiny size 2 women<
FWIW, I find that many slightly heavier ladies tend to have better connection with the floor, and are often easier to connect with as partners, in terms of feeling what each other is doing movement-wise - especially when their movement is good. Some very light ladies can feel like refrigerators (if untrained) or emptiness (if they have no power and strong floor connection) to move with. I also find it very satisfying to be able to distinctly feel a lady's moving mass in the Latin & Rhythm dances telegraphed through the light hand connection - even though I find very small ladies more attractive off the floor. Just my one cent - YMMV. Maybe what it comes down to, is both partners' ability to equally contribute to the shared physical effort and powering of good lead/follow movement.