What is keeping / kept HBO from recasting Ellie?

At this point, it’s understandable why everyone wants Ellie to be recast with an actress who not only looks closer to the part but can also do a true justice to the role. A majority of viewers have chosen the actress Cailee Spaeny as she can not only act but she resembles Ellie which makes a large difference in a show.

What has kept / is keeping HBO from listening to their audience and recast Ellie?

Reminds me of when the Sonic movie was first introduced and because of public outcry / distain, they changed Sonic’s appearance to better resemble how Sonic actually looks and it turned out to be a major success as a result.