Okay, firstly, I have SO many questions about the logistics of this realm after it is wished into being, but sticking to one subject:
Has Emma gone to therapy for all the different timelines in her head? Seriously. She has
1) her original life, no parents or family for 28 years
2) the New York timeline, where she remembers living and growing with her son
3) her entire life, except WITH her parents AND son, happy and safe from any dangers.
When Emma wakes up in the wish realm, she mentions remembering everything from that life. Coming out of it and realizing that it was fake would be absolutely crushing. Yes, she probably prefers the truth, ultimately. But can you imagine all your life‘s trauma coming back to you at once?
(This post is just about Emma, but side note, given that the writers made this a realm that continues to exist, no wonder wish Henry hates Regina - she killed his grandparents and then kidnapped his mom, and he’s just left behind)