Thanks, I missed this. This image is particularly salient on both the hand span and gender arguments: http://smallpianokeyboards.org/wp-content/uploads/2019/02/Ri...

Edit: Though interesting to note that there's been some effort at balance in terms of national acclaim, but if smaller handed competitors had access to scaled keyboards, it's possible that their would be better international recognition of female players.... or it could expose a gender bias.