The main issues Vancouver seems to face are:
Affordability and Housing Crisis: Tokyo is a remarkably affordable city given its status. There’s housing stock at pretty much every price level.
Homelessness and Street Disorder: not a problem in Tokyo
Drug Addiction and Overdose Crisis: not a problem in Tokyo
Traffic Congestion and Transportation: public transportation is stellar in Tokyo. Traffic can get pretty crazy at rush hour, but I hear that’s been the case for a long time and it’s not much of a problem if you use the aforementioned fantastic train system.
FWIW, I left San Francisco after close to 15 years due to the issues above. Tokyo has its problems, but they don’t seem to be in the same category.
And while I agree that public transportation is excellent, commuting every day on crowded trains, which can take an hour or more for many people, would be hell for me personally.
[1] https://www.reuters.com/markets/asia/surging-tokyo-property-...