I am a US citizen living in Canada. This year, I am beginning investing. I have purchased VOO (in a non-registered account) and would like to add some US-Listed ETFs with other sectors/markets to balance things out (also non-registered account). On another forum, I read that sticking to 1 or 2 ETFs will "make life SO much simpler." Why? And is "simple" worth it at the risk of not diversifying? (Yes, VOO is well diversified, but it has no global presence and is tied to S&P.) Any advice on the tax situation for CRA and IRS is greatly appreciated as I bumble through this!!!!!