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While the benefits are limited, there are advantages:

1. Harvesting your capital losses allows you to offset other gains which may be taxable at an earlier date. $1000 today is worth substantially more than $1000 in 10 years time. 'Tax deferred is tax avoided.'

2. You can offset up to $3000 of losses a year against regular income which is taxed at a higher rate.

For me at least while it seems worthwhile to switch index funds to harvest losses when the market falls substantially the upsides aren't enough to justify the lock in of using something like Betterment's automatic tax loss harvesting features of their platform by having you invest in many individual stocks managed by their roboadvisor rather than an index fund.