Which linguistic design principle led to the breakthrough success of Duolingo's language learning method compared to traditional approaches?

In the world of language products and services, design decisions can make or break user experience. From language learning apps to translation services, the way these products are designed impacts how effectively we communicate and learn. This poll tests your knowledge of how linguistic principles inform product design decisions in language-focused products and services that millions use daily.

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Spaced repetition algorithm that schedules reviews at optimal intervals for memory retention
Exclusive focus on academic linguistic terminology to build proper language foundation
Prioritizing complete grammatical understanding before allowing practical usage
Eliminating native language references to create full immersion from day one