Now that there is skill and trait

I think that no this is no good XD
Just because
You will never get ride of the overheal

As a healer 85% of my time is spend into dps with that samurai i would be 100% DPS and heal
Not so bad except in enmity

Just to be clear
IF you see an actual healer playing at a far ranged position then he is doing it wrong

No healer should be away of the group

So yes the samuraï would be easy

...

I don't get the part "need healing get closer, no healing back off"
It's aim to who ? Since the group should always be pack XD