because setting up and using anki is a pain? using and configuring anki is not intuitive. if you're just starting, you'll probably need to find a good premade vocab deck. once that's done, you'll need to make cards. making cards manually is a pita, i would probably not make any if i didn't have a good mining setup (yomitan/ttsu reader/asbplayer). i've spent countless hours getting my mining setup just right (setting up anki and yomitan, tweaking card fields/templates). yomitan probably works well because japanese conjugation is so regular. i imagine for languages with less regular conjugation, it wouldn't be so nice.