At level 80, I was 1 shotting a lvl 50 mob in the open world with my dot before the squish.
Now at 90, I do less than half of it's hp.
"you will not feel a difference after the squish" they said in the live letter....
Thank you square enix. Thank you very much. /sarcasm
Never had mana issues or lacks of heal potency though.
If you have to heal A LOT (and therefor have mana issues), it means your party members suck at doing mechs. Not your fault.
Liturgy is OP if you know how to use it.