/jp/ - Otaku Culture

Anyone use Duolingo? I've been grinding my kanji flashcards on and off for years and I've recently started using Duolingo to learn my grammar. Since I know my kana and a lot of kanji already I'm basically ignoring that whole section of Duolingo. So far mostly so good but I feel like it's not using enough kanji in the example sentences, like for instance I'm happy to learn a word like にぎやか in kana the first few times but I'd expect it to start using 賑やか after a while and that doesn't seem to be happening. Does Kanji usage depend on how much of the kanji I've explicitly learned through the app?