I just took a quick glance at the Routledge French Frequency dictionary. The frequency of words in each 1000 word band drops by about 50% in each subsequent band, so there is definitely a point of diminishing returns. Those words around frequency level 5000 only occur about 200 times in the 23 million word corpus. Around frequency 2000, they are occurring in the range of 500-1200 times in the corpus. The author looks at how broadly they cross the corpus. A word that has a narrow focus has to be repeated more times to get it's ranking elevated when compared to a word that is more widely dispersed. So if I run out of gas on the frequency dictionary before I get to word 5000 and switch to just adding about 10 words per day from random encounters, I can say I've done that based upon the recommendation of the informed. I will be, as Newton once said, "standing on the shoulders of giants"! So, back to the original post about the Fluent Forever approach to vocabulary and my experience with the three cards I made using it, it does seem like pure genius to use that method for the most frequent 1000 words or so. (some words don't fit Anki word model, so that's why the author doesn't use a strict number). Since I'm pretty solid on that first 1000 words in French, I may have already hit the point of diminishing returns for using that approach, since it requires more time to compose each individual flashcard. Or maybe I'm just lazy.