"I've been surprised at the level of contempt"

Lorne Rubenstein sat in on a Stack and Tilt clinic with Mike Plummer and Andy Plummer and relays his observations.
Meanwhile, some teachers and players have been critical of stack and tilt. Well-known instructor Jim McLean points to photographs of Nicklaus that he says refute the impression that he didn't shift his weight during his backswing. Six-time major champion Nick Faldo works for The Golf Channel and was critical during the Mercedes telecast.

"I've been surprised at the level of contempt," Plummer said.
Some of the complaints came in this Golf Digest piece. And here is the answer why there has been so much contempt:
But students have been doing well. Weir has been working with Plummer and Bennett for more than a year. Aaron Baddeley has won twice since beginning to work with the twosome. Plummer and Bennett are in demand from professionals and amateurs alike, and believe their critics wouldn't be so harsh if they understood their ideas. Their database includes more than a million swing photos.

"Just to be clear, though," Plummer said, "we're not doing this because Nicklaus and Ben Hogan did it. They're examples of what we're saying."