The Doctor's amnesia is brought up as a huge mystery right from the prologue along with cryptic scenes such as a mysterious voice speaking to them, and a flashback of Amiya talking to them in an old place. But for a large part of the next story chapters (e.g. Chapters 1-6), this whole amnesia plot is rarely brought up again and sidelined in favor of Rhodes Island stopping the Reunion Movement's plans in Lungmen. The prologue also hints that the Doctor may recover memories through flashbacks, but that's the only flashback instance in those chapters. Some characters like Kal'tsit and Amiya are also hinted to know more about the Doctor's past but don't actively try to help recover their memories despite being on the same side. And judging from her Cryptic Conversation in the first chapter, W is also hinted to know a lot about the Doctor, but unfortunately, she barely interacts with them after this scene. It's worth mentioning that the "Darknights Memoir" side story and Chapter 7 of the main story are well-received among fans in terms of worldbuilding and lore because at least, those finally try to focus on the Doctor's past, slowing solving this whole amnesia thing as compared to the earliest chapters.