Wrong. MF and ETF are delivery mechanisms. Active and passive can be found in both wrappers. Lower fees are good, but not to the exclusion of other factors. Costs of rebalancing is not the biggest problem. Rather, it is the cost of not doing that rebalance when the markets are in turmoil.

One option?. Use a BMO ETF portfolio in series D. MER of about 90 bps, no fees to rebalance, no fees to buy more, and rebalancing done for you automatically.