thinking that you are smarter than your parents, lateteen-early 20s disease? seems fairly parseable tbh. although mark twain wrote his yankee in king arthur court in the 50s, so it might be impressive technological progress over lifetime brain compression (if i only knew (x), then i would have made so much (money/power/lessened suffering), so in a way, regret?

decided to do vibe check:

The data also helps us better understand who watches isekai anime. In Japan, the most engaged audience tends to be older men, especially those over 30. Overseas, the majority of viewers are also male, with an average age close to 30, which is higher than the overall anime fan average.

seems like regret/quarter-life crisis is likelier to be predictor than late teens i know everything vibe