And on top of that, they were special in that they were a renegade representative of a godlike species that normally doesn't intervene with what they deem lesser evolved species. Rebelling aganist that and finding the beauty in all forms of life was what made them special. The timless child actively works to make the Doctor less interesting, as it removes that rebellious aspect of their personality. They are now, after all, not really rebelling against their own nature or society, but against the people who took advantage of them, while at the same time becoming some kind of christ-like figure.
To play devils advocate, I think Chibnall wanted to bring back some aspect of mystery to the character. The title of the show is Doctor Who, and the identity of the doctor was very slowly unravelled over literally decades. The time lords wasn't even a thing until the second doctor regenerated, and I have no doubt there were people who had opinions about that reveal back in the day as well. After the show was brought back there was so much information available on the Doctor that Davies wisely introduced the character as the last survivor of an unimaginable war, bringing back some mystery to the Doctor. But Moffats entire run was dedicated to dissecting the character (and the time lords, to some extent) to the point of absurdity, which resulted in any real mystery being pretty much gone by the end of his tenure. I can see how Chibnall wanted to make the character an enigma to the viewer again, and not just to their companions. It just gets absurd to pile on even more secret backstory to a character who is already so convoluted as the Doctor, and Chibnall really didn't even build up to it in an intriguing way. It was an infodump more than anything.
