Youre really learning the readings when you do the vocabs cause the readings for the Kanji in WK are usually only the onyomi. The kunyomi being presented with the okurigana (the kana attached) in the vocab.
You can think of WK as
Use the “Radicals” to better grasp the Kanji
Use the Kanji to better guess unfamiliar compounds
Use the Vocabulary to learn readings
If you want to learn the Kanji WK at a certain pace, read this guide:
https://community.wanikani.com/t/my-journey-of-368-days-the-ultimate-guide-for-wk/31318/2?u=sorar
Then space out the vocabulary to fit your timeline. Knowing only the Kanji can be useful if for example you mainly want to be able to understand signs or what not for travel.