i believe these changes should be done to help effectively keep diversity among talents with out getting stuck to advance to higher tiers with out forcing players to pick up other talents that they do not want.
Tier 4 (should be Tier 2)
Increases the range of your Smite and Holy Fire spells and the radius of your Prayer of Healing, Holy Nova, Divine Hymn and Circle of Healing spells by 20%.
Tier 5 (should be moved to Tier 4)
Reduces the mana cost of your Prayer of Healing and Prayer of Mending spell by 20%.
Surge of Light
Tier 6 (should moved to Tier 5)
Your spell criticals have a 50% chance to cause your next Smite or Flash Heal spell to be instant cast, cost no mana but be incapable of a critical hit. This effect lasts 10 sec.
Tier 4 (should be moved to Tier 3)
Reduces the mana cost of your Dispel Magic, Cure Disease, Abolish Disease and Mass Dispel spells by 15%.
Rank 5/5 (change to 3/3)
Increases your total Stamina and Spirit by 2%/4%/6% and increases your spell haste by 2%/4%/6%.