Why not? Any proof of that?
I did never use it, but only because it seems for me too boring and unnecessary.
Define harder.
So, I'm using a calm spell, make a sneak attack and using a calm spell again, until my victim is death. Or I conjure an atronach an attack the back of my victim while it is fighting the attronach.
Raising the health of the victim just let me level faster! So, in conclusion, harder or easier is not in the mod itself, it is in the play-style!
For the protocol: I'm a re-starter. My characters start with a feeling of being weak. If I feel that they don't need to fear anything, I start a new character. To keep a character long enough alive, I do not use anything what would rise the leveling, including using stones and sleeping. (Except to join the brotherhood or speak to the ghost of the old friend of Hjalti.)