Which product design approach has had the greatest impact on mathematics education tools in the last five years?

The world of mathematics education has seen dramatic changes in product development approaches over the past decade. New technologies, teaching methodologies, and market demands have transformed how mathematical tools and educational products are designed and marketed. This trivia question focuses on a significant trend that has influenced the product design landscape in mathematics education.

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Adaptive learning algorithms that personalize content based on individual student performance data
Nostalgic design returning to traditional physical manipulatives with no digital components
Abstract visualization tools focusing exclusively on theoretical concepts without practical applications
Single-difficulty standardized content delivery systems designed for classroom uniformity