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There's a spirited debate, in the shout box, as to the value of Cano's "net drill." Some think it's a panacea; others think it's just the "placebo effect" of having a Real Hall of Famer(TM) personally coach you. One amigo wondered, plausibly, whether Smoak had actually done the "net drill" from the right side of the plate anyway (before his short, off-field double that day).
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First of all, here is the Ryan Divish video. It shows Smoak taking batting practice, with a "fence" (net) set up close to him, so that he has to swing with the knob of the bat on his belly button.
If you're going to read further, YOU MUST VISIT THIS PAGE FIRST. ;- ) Very simple texts, awesome .gifs.
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Second of all, it is true that most hitting tweaks don't matter much. By "MOST" we do NOT mean "ALL."