I disagree that it is in fact "balls"
while it may be difficult to acheive a usable result with shuffle that are mroe complex, it is still possible a fair percentage fo the time to gain some information for the next shoe by following cards through evna complex shuffle.
I view more complex shuffles as having a lower probability of a successful track since clusters of cards are often broken up, or diluded very heavily.
It is still possible some percentage fo the time to gain an edge from your efforts in any shuffle.
I dont declare myself an expert though, or maybe i am and i dont know it. Thats just the way i see it.
Even a comlex shuffle if done by a dealer that is hasty and sloppy can become very exploitable.