It sounds like they have people who can take film and break ir down to the pitching components, a lot of built up data and understanding, and some really good people who can not just tell the pitchers what to change, not just show them what they mean, but also listen to the pitchers during the feedback session.
People, data and culture, so even poaching a guy or two, it would take years and commitment to get everything up and running. Also, the Brewers have had documented success with their methods. That gives the pitchers more incentive to make the recommended changes.