All healing mechanics out of combat are weak.
We have +4 regeneration essence outside the settlement (F tier)
We have healing tent that takes 30s to build, has small range and is expensive AND has upkeep
And natural regeneration of 1hp/s
While for healing in combat we have Priests (pretty good)
and 8% blood thirst essence for knights (S tier)
For a game that averages 50ish or less minutes for a skirmish, healing out of combat is way too slow.