Reviewers at The Young Folks and TV Fanatic noted that the "Memory Lost" storyline was an effective way to handle actor Dylan O'Brien's limited availability while grounding the final season in high emotional stakes.
The episode ends with a chilling sense of void; Lydia knows something is missing but can no longer name it. Critical Reception [S6E1] Memory Lost
The episode demonstrates that a person's existence is partially defined by those who know them. When Scott, Malia, and even Sheriff Stilinski forget Stiles, his reality literally begins to dissolve. Key Narrative Beats Reviewers at The Young Folks and TV Fanatic
As the characters approach college, Stiles clings to supernatural mysteries to avoid the "mundanity" of graduation. When Scott, Malia, and even Sheriff Stilinski forget
The final scene between Stiles and Lydia is widely considered the episode's emotional peak. Stiles recounts their history—their first dance and the times they saved each other—culminating in his final plea: "Remember that I love you" .