Why is this a niche use case? Are you suggesting that people will change their passwords after they created an account and realize that it needs a better level

Why is this a niche use case? Are you suggesting that people will change their passwords after they created an account and realize that it needs a better level of security? Because I would argue that Collection #1-#6 proved the exact opposite: Humans reuse passwords, and invent sequences or suffixes when forced to change it.