Why is vocab the most complicated and most abundant in Wanikani

I think what MissMisc is talking about is that with a script like [Userscript] WaniKani Lesson Filter you can do the radical lessons of e.g. level 5 before having done all the vocab lessons of level 4.

That in itself is not a bad thing if you want to move faster, but if you’re still having open vocab lessons from level 4 while already being level 6 you’re not doing yourself any favors.