How different do you think the WOT5K would have gone if Shireen was a healthy boy of the same age? Or if Sweetrobin was a healthy girl?

I think it would change things mostly in the margins. If Shireen is a boy, then Stannis’ dynastic line looks healthier, so he might get a bit more support from the outset.

But Sweetrobin being a girl I don’t think changes much, except adding a competition for her hand that’s more intense than that for her mother.