completely agree hereThe problem with "teaching to the test" exploded in public schools in the 90s as these Federally mandated and oversimplified evaluation mechanisms came into play. I remember well several conversations with my mother about this.
The benefit is more about localized decision-making, regardless of the type of school. When the Feds came in with heavy-handed one-size-fits-all approaches that took away local control, charter schools and similar workarounds were inevitable.
It's all tradeoff management. For most things, the further up the hierarchy decisions are moved, the worse the result for most people. Centralized planning mostly sucks rocks.