My rule for deleting history on a mesh is make sure its at the lowest base mesh. (SAVE A FILE BEFORE DELETEING) and if im happy with it, then i'll delete history. That way i can smooth the model after word and know I can go back down to base mesh in the channel box.
I am enough of an artist to draw freely upon my imagination, knowledge is limited, imagination encircles the world. (Albert Einstein)
https://www.artstation.com/kurtb