But we don’t really know if George would have wanted that. We know that he wanted the protagonist of the sequel trilogy to be a woman, but we have no record of him wanting her to be Luke’s daughter. I would be wary of making assumptions about that kind of stuff. All you have to go on is your own personal opinions, which can be biased.
Leia is a Skywalker too. So the granddaughter may not have been Luke’s.
Jett Lucas also implied as much after The Force Awakens when he compared it to the animated Anastasia film.
Even Pablo Hidalgo said the starting point of what George left them was about a girl Jedi.
These too.
So it’s not really assuming but going off of what we’ve been told by George and others.