8 accounts, 7 different ETFS + 5% cash, covering global diversification 70/30 equity/fixed, I can definitely understand the appeal of the Asset Allocation ETFs, now available also from Ishares and BMO. I started ETF buying literally a month after the first global all-cap came out and could have saved myself 6 ETFs, but I chose to stick with the plan, and have done so since, except for deleting VSB emergency fund for HISA and changing VUN for VTI.
I do like knowing I hold bonds only in RSP, US total only in RSP and Canada only in non-registered, saving a fair amount of taxes. MERs being lower helps too, and there are ways to trade for no commission fees at all, except VTI.
I am also overly home-biased, but chose so, could easily change it.
This does take weekly monitoring, mostly for fun though. Rarely do I rebalance to stay within +/- 6% as per my IPS. (I'm 3.1% low on bonds right now, new money is going there, or HISA)
Family member who just started TFSA investments in HISA, the only next recommendation I have is VGRO or VEQT, after the 4.3% HISA I shared.