Generally on a white mage you can just bin cure 1 out of incredibly niche scenarios, both cure 1 and 2 cost a gcd, and the mana difference is inconsequential (especially because whm has essentially infinite mana unless they need to chain res). Also in the case of damage, all the healers have powerful aoe attacks (especially whm) so contributing to the party damage essentially means you nee to heal far less and everything goes a lot smoother at basically no cost.