I'm sorry what? Not a big deal? Have you actually healed any savage? (I actually ask because it seems you've only done 9-10-11 as RDM/DRG)
A crit adlo spread litteraly trivialise most Healing mechanic.
Just to give a few examples
OS9 : Litterally nullify a Earth phase Healing on tank/heals.
OS10 : with enough buff (largesse, conva, Healing buff from fairy, BRD buff etc) can litterally absorbe an entire arkmorn. (You do realise that most party wipe on those 2 arkmorn at the end)
OS11 : Almost entirely absorbe any combo of Deadly AoE such as the Photon crap + FlameThrow + Rocket wombo combo or
OS11 : Can absorbe both the big hit from the fist + omega share right after (1 gcd... for all that dmg)
OS11 : Litterally remove the need for Healing on panto2 Diffuse + Canon
OS12 : Makes Hello World Healing nearly non existent (everyone can absorbe 2 sources of damage without loosing health)
UwU Garuda : Absorbe an entire debuff explosion on the Bubble or when the sisters come for the fourth debuff making it much safer
UwU Ifrit : Can absorbe the first nail, explosion (and a bit of the second one) easing Healing quite a bit
I could go on...
And fishing isn't a strategy because you Simply Don't have the time to do so most of the time. (and it's pointless)
At best you may shoot 2 adlo but fishing for an adlo crit (when you actually can) is just a waste. And usually you can on the first boss, not the latter one.
30% is still low (technically speaking), with 30% crit chance you have
First adlo - 30% chance
Second Adlo - 51% chance
Third Adlo - 65% chance
Fourth Adlo - 75% chance
I mean... 75% may sounds high but if you base off your strategy around that fishing, well there's still 25% chance it fails after 4 cast ('and that's assuming you have the time)
Repeat that a few time and the odds are definitely against you...
So definitely crit deployed a huge deal and the only thing that makes it, somewhat not too entirely broken, is that it's gated behind that rng crit.
The difference between having a deployed crit and not having one is so drastic everytime my coheal gets one it makes the next Healing mechanic trivial. (assuming it will actually do Something)
WHM has Cure III, Medica, Assize, Medica II, Asylum. SCH has Indom, which is amazing, but on a long recast, Whispering Dawn is on 50% of the time, and Succor with ET is decent but still weak and costs a ton of MP. Giving a 20s window for the fairy's heals to be AoE wouldn't be that big of a deal, considering the low potency of Embrace anyway. I guess they could also just make Rouse into a 1-time ability (makes the NEXT Embrace into AoE and gives it +100% potency?) to make it into a 60s recast cure III?
SCH one weakness is the inability to effectively spam AoE heals for an extensive period of time... so? It's not like it's needed anyway...
And this is why you have 2 healers in a party isn't?
I Don't see that as an issue in the slighest.
If that's what you really want they could also Simply make Emergency Tactic a 5 or 10s cd. But if a SCH+AST can heal through Garuda bubble/Ifrit nails, then Nothing else in the game requires more.