Both skills deal ± the same damage. At C1, Aqua Benedicta is a lot stronger now.
I think it is essential to keep Rubric a low CD skill simply because Clerics usually don’t have low CD magic damage skills (few examples are Effigy and Damballa, can’t come with others cause most have 20 seconds+ CD time, which is already medium tier CD).
While Sadhu/Krivis might not suffer from a longer CD time, a lot of possible Class combinations will suffer.
Also, considering the damage of Rubric, Monks Double Punch level 15 can deal ± the same damage within the same amount of time with a certain DEX investment as a Rank 5 damage skill, because it has no downtime.
The damage of Rubric is thus well-balanced for a Rank 8 skill.
It also doesn’t really synergize well with other skills [except Transmit Prana] in contrast to other skills that can benefit by e.g. Deprotected Zone, strike debuffs, melee buffs/elemental buffs (e.g. Storm Calling + Fanatic Illusion or Conviction + God Smash),etc, so it needs to be strong from a standalone-point of view.
Last but not least, strong holy property skills will benefit the gameflow, as it will become easier to bring down Velcoffer, Kugheri Balzermancer & the Demon Lords.
“Fret not, the Exorcist has come!”