Diamond doesn't, but it can put you into high level CC with crystal, especially the now omega+ ratings that know how to sync burst well enough and insta delete someone. Purify may often not save you because the time for you to purify is the time for the damage to become lethal or drop you too low to recover from, but if it does, then you appreciate getting that additional second. But even in full Diamond you can get situations where the incoming damage is so high that you'd benefit from it too, imo.