The most basic is to be able to wake up without alarm clock, and to sleep at anytime you want (for those whose children have already grown up or left home).
I look up TFSA. There is a contribution limit of $7k per year. It will take forever to reach $1M just for tax avoidance.
Some of these schemes sound great, but not possible to do tax avoidance in reality, one needs to be actually working and living for decades in Canada.
In the end, retaining Singapore tax-residence will be the most realistic option for most normal retirees < $5M (not the super-rich retirees >$10M).