Selling anything at a loss decreases the overall CGT you need to pay by offsetting the capital gains.
Everyone gets a bit het up about capital gains, but really, the tax on capital gains is generally rather small, especially in a super fund, where, even in accumulation phase the tax is only 15%. So, say you buy something for $100,000, and sell it a year and one day later at $120,000. You have made $20,000, but because it has been kept for more than a year, you actually pay CGT on $10,000, and 15% of that is $1,500. And, if you are following the buy and hold scenario, you never sell so you never have a CGT event. And, if you wait until after your superannuation goes into pension phase, you don't pay any CGT - not even when your husband dies and you get his superannuation, because you are his wife.