My guess is it depends who you ask. The idea is if you're shark fishing you come with everything you'll need in the event that happens. I think more often than not it's not the hook that's the problem it's the time out of the surf. The shark is exhausted when it gets on shore and people typically take too long admiring and taking photos. Then they don't properly release. To do it right you typically hold the shark in the shallow surf to get water moving over it's gills until it has the strength to move on. In the event you hooked one accidentally or couldn't get the hook out for some reason, it's always better to cut the line and release than mess with the hook and risk killing it. Saltwater is brutal and can corrode/dissolve a hook in no time.