Fey Blessing isn't meant to be as powerful as Whispering Dawn. It's just a direct heal on the party.
But to me, yes, while its looked good on the paper to have another skill using fairy gauge, that 10 gauge cost is just weird.

It would have been better without the cost and with how the fairy acted before (pet action not being characters action).

Otherwise, it feels "nice" coupled with Indom for an extra heal when HoT is not up and Indom not fully restoring HP bars (considering you need to heal your party because of several aoe party burst).

Not the best skills we got, but still has some nice uses.