Offsetting Capital Loss, page-16

One reason that might apply to those who are elderly is (as far as I am aware) that capital losses get lost if you die and your share assets pass to your heirs.

A second reason is purely administrative and can be an issue of you have a big portfolio. If you have carry forward losses, you must retain, for tax purposes, your historical trading records of all years that you have had a carry forward loss until 5 years after you have eliminated carry forward losses. So in your case, you must retain all your share trading records from the GFC onwards until 5 years after you eliminate the carry forward loss.

So assuming your first year of carry forward loss is 2008 and you eliminate the CF loss this tax year, you will have to retain all those records until 2023 (15 years of records). If you wait another 10 years, it will be 25 years of records.