The reason most high stakes players demand anything is mostly superstition. Voodoo nonsense. In some cases, knowledgeable players will demand better rules, but how the cards are shuffled really doesn't mean anything unless you are an AP who is attacking the shuffle. If you are tracking, it matters. If you are sequencing, it matters. If you are spotting cards during the shuffle procedure, it matters. If you are just counting, the only difference it makes is in game speed, and a counter should want whatever maximizes game speed, which in this case is the machine shuffle, all else being equal.