Crit regens or overheal because of crit isn't always a bad thing. GCDs saved on healing is really the end-goal. Crit is a way better benefit than SpS on all healer jobs.
Not only the crit damage factor, it can save MP, maybe even save Plantary stacks like on ExDeath Savage where every ounce of your healing you put out kind of matters.
You never depend on crits but there will be instances where you usually on stacks for follow-up healing or the SCH using Indom to help something and you'll notice and just return to doing damage.