Yep. They hired people with a hammer, and every hitter became a nail.
With someone like Moniak, knowing he'd naturally develop power as he physically matured, why would you mess with his stroke? At most you help him make subtle adjustments, like being able to pull inside FBs when you're ahead of the count.
This is also why I think a new coaching staff could make a huge difference, Vierling made a big jump when he got his own hitting instructor and ignored the team's coaching. You take a kid like Moniak, go back to the film that got him drafted high, and get him doing what worked for him.
It's not just the Phillies who are stupid, Appel was a dominant college pitcher throwing a great 2-seamer, then Houston decided he should be a 4 seam pitcher, instead of working with what he excelled at and tweaking it (teaching him to throw a 4 seamer high in the K-zone as a "show me" pitch to make his 2 seamer more effective).
Different strokes for different folks, if Ortiz can't fix his contact issues, he should be coached to be a high impact player who focuses on walks and HRs. Haseley was a contact hitter with gap power, why change it?