That's interesting. I am wondering if you are aware of any blatant shortcomings when a person moves the accounts to TW. For example, based on my very limited research, index funds seem to be more expensive if not difficult to buy in TW. Also, it seems we would not have access to NYSE or TSX listed securities. If you are aware of ways to overcome these inconveniences I would be happy to learn from you.

Here is what I am thinking:
In Canada, a person's income tax obligations to Canada is based on residency and not citizenship status (unlike in the US). In certain cases (ie, being a resident of a country that has tax treaty with Canada), a person may be deemed non-Canadian resident even when the person maintains significant residential ties with Canada.
Like everyone else, I am trying to optimize tax obligations. Since we FIRE'd, our tax bill went down by ~80%, alas it's not zero.
Thanks.