Is WaniKani sub-optimal?

This is why I use @seanblue’s Lesson Filter script:

This way I can tell WK I want to learn 10 items in which 3 are kanji and 7 are vocab (or 6/14, or 2/3 if I’m pressed for just one batch), and I find that that keeps things rather even with regarding to how many new lessons I have waiting for me.