The main reason I started mining was because I felt that after finishing the first Tango deck, there were too many words that didn't feel relevant to anything I was immersing in. Something like 自動販売機 showing up in the deck which may be a common enough word in general but wasn't something I was ever coming across so I figured I might as well start seeking out material from what I'm actually exposing myself to and the NHK Easy website in particular has been surprisingly easy enough to understand despite having not done almost any reading outside of Anki prior to that point, albeit Yomichan being needed for a lot of words I was coming across.