bruh sacred soil is literally the best heal sch has. it has the highest potency (it even heals more than lustrate on single target if you place it on top of them) and it mitigates too...

you could argue a lot of skills arent "needed" cuz you can clear content without them. i cast helios/medica/succor once in a blue moon but it has its uses. you could clear everything with just gcd heals and no ogcds too so clearly ogcds arent needed either right

and yes cohealers exist so you dont have to use all your resources all the time, thats nothing new.