I know too many people who used a variety of Anki decks in their effort to learn Japanese so that they could cram in as much new information as possible each day.
They would do 30-50 items per day, and they’d feel great for the first week or two. Then all of a sudden they have a day where they can’t quite find the time to get to Anki because real life happens. Suddenly they return to find they have 500+ or 1000+ reviews to do, their motivation completely dies, they stop SRS altogether and within days, 95% of what they “learned” is cleansed from their brains.
The reality is, you can only stuff so many things into your brain at once - and this is coming from someone who completed WK at nearly max speed and who went from near-zero to close to N2 reading level in a year. I constantly struggle to find a balance between pushing my brain to its maximum capacity and giving myself enough room to breathe that I don’t burn out entirely.
If you’re serious about learning Japanese, kanji recognition alone isn’t going to get you there. There are so many other things you’ll need to learn, and you’ll also want to be immersing yourself in native material as much as possible as soon as it begins to be comprehensible to you. Thus, the less time you can spend on WK while still learning something new everyday, the better off you’ll be. You’ll want those precious hours to learn grammar, vocabulary, get in some listening practice, read a book or a newspaper article, write a few sentences, etc. etc…
WK is designed to encourage long-term, habitual learning. The idea is that it’s better to learn a little bit everyday for a year than to learn a lot everyday for 2 weeks or 2 months and then burn out.
If after reading all that you still see no value in WK’s natural pace, then you should probably find another resource - there are lots of them out there. But I can tell you that WK worked extremely well for me, and I wouldn’t be at the reading level I am if not for making it a core part of my daily language learning routine.