Review Detail of shotoguns in The Rebirth of Evelyn Knox

I really wanted to give this a higher rating. The cultivation aspect of this story is nonexistent. The protagonist has this really overpowered cultivation technique but has never been seen on screen using it, nor has she gained a single level from using it. Others have been seen to get multiple levels of experience from cultivating but our OP MC has not gained any. It’ very strange and makes me wonder why cultivation even exists if all the MC does is power level from killing mobs. Logically our protagonist could go power farm beast after beast and get level 100 in a few hours with her teachers help. Higher stats lead into better killing power = now you can go deeper in the forest and repeat the cycle.