I dont know if I am missing your point you are saying using a barbell is superior .. right for building stregth ?? when you use a barbell the movement is a fluent smooth action... Kettle bells, stones, rocks, sandbags, logs etc are different to a barbell because they are more practical for sports, mma etc they are awkward, the weight is not balanced..... you cannot get this same stregth from using a bar bell as comapred to using all these foreign objects.... Thats my opinion...