Portfolio rebalancing can take up considerable time and energy, and it can create a tax burden for those who have taxable investments. Investors face the same questions on when to rebalance whether they have portfolios of individual stocks or ETFs. It's my opinion that we might think about rebalancing too much, and that it often does not require our attention. We might let our portfolios run and drift.
I recently covered Is it time to rebalance your portfolio? Through that writing and reflection I started to drift even more to the camp of passive behaviour