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I think you just had a failure.
PVC should last as long as any braided flex line or even the solid chrome plated copper. I'm sure every plumber would like an income replacing those flex lines every five years. It keeps them out of the crawlspace.
I've had to inspect modular homes that use the same tubing inside the walls as we use in the RV. They actually have a distribution system that feeds fire sprinklers and domestic water with the same plastic distribution lines, and UL accepted it for permanent applications.
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