Genuine rigorous testing of educational ideas is rare in America. Why? Because practical testing usually goes against what the professors want to do. Their impractical ideas don't perform well in the real world.
For example, Operation Follow-Through was the biggest, most systematic testing in American education, continuing for 10 years 1967 to 1977. This research showed absolutely that common sense, often called Direct Instruction, works best. Quite simply, that's where a teacher teaches, and students learn. Honest educators would say, okay, that's what works best, let's use it.