I’ve been doing this approach myself a little bit of doing a prioritization of radicals → kanji → vocab and I’m sure this is echoing a lot of what’s being said but it definitely is very person-to-person.
I came back after a long break myself and have stayed consistent for the last 22 levels taking roughly a week each by following that sort of optimized method. To share some perspective the way I look at it is: Leveling up is not a promise of mastery, it’s just a reasonable progress point that you are likely ready to learn more items now. Wanikani itself is a tool operating on a sort of curriculum, guided format (compared to like say other tools that might just let you cram as much as you like).
So within a curriculum format one thing is that you have to know which ways your learning styles match and don’t match it. The recent daily lessons update tends to automatically focus on a balanced spread of radicals, kanji, and vocab all at once (if available of course). That is what will generally work for the widest amount of people. You can take the time to decide if it works for you too.
Skimming a lot of the replies in this thread has kinda seemed like a bit of a question of “is language made of letters or is language made of words” and honestly it doesn’t really matter because by the end you will need to know them both.
“Is there any reason not to focus on leveling up and learning all the kanji before going for the vocabs?”
I could get like overly philosophical from here and say “what is reason” and “it’s all subjective” but I’m going to assume for the sake of brevity you very likely learn at least some degree similar to me and the others in this thread. So the subjective answer that you can ignore if you really truly want to is that It would be really really helpful to you in the long run to at the very least, if you are going to prioritize kanji, to keep your lessons queue trimmed down and at least learn the vocabulary for a level within a few levels of gaining it
So like, I hit level 38 but I still have a little bit hanging on from 37. At worst, my lesson queue grows to something like 200 vocabulary, but it’s on average under 100 and at least once per week it is cleared back to 0. Part of this is from also being someone who reads outside of wanikani and looks up grammar and linguistic things about japanese just out of pure interest. before level 25 though I was just only focusing on wanikani.
if I were to try to keep it short from here and summarize:
-Doing only the kanji is not a viable long term approach, but if it works for you in the short term, that is your method and nobody can take that from you.
-Prioritizing the kanji but still keeping your vocab lessons flowing is a much more sustainable method and what I personally do myself and recommend. It has caveats.
-it ultimately depends too how much time you want to spend on wanikani after you hit level 60 still burning your unburned items. If you feel you wouldn’t mind an extra year or so spent burning purely the vocab, go for it but also Buyer Beware.
my last personal note though is that I do think it is best above all to try to empty your queue frequently and make the mistakes in a healthy way. If your level ups are gated by radicals and kanji, optimizing your pace with them means that there is not really any harm to making your mistakes with vocab in the interim. The time is going to pass regardless, so again consider what you want your workload to be, but also consider that there really is no harm on like, spending 4 weeks getting 大仏 wrong because you intuitively answer “Giant Buddha” and get flagged as wrong for not adding the word “statue” even though you know there arent exactly any flesh and blood buddhas standing around and walking at 50 ft tall. Wanikani isn’t a class you get an A in, it’s something meant to give you what you need to build a solid foundation for learning a language. Mistakes are the absolute best way to learn, the faster you fail at something, the faster you’ve learned what you did wrong.
Hopefully this was not too wordy. Sorry if it was.