Radicals on Wanikani aren’t the traditional radicals you would find in a dictionary. They are just smaller parts of bigger kanji that the authors of Wanikani named on their own to make up stories they use in the mnemonics. There isn’t any use in learning the Wanikani radicals if you aren’t interested in using Wanikani to learn the kanji. The stories that they have come up with for the kanji are meant to be strange and unique–you won’t know what they are unless you read them on Wanikani.
Getting fast through the levels isn’t the same as getting proficient in Japanese.
