\textcolor{pink}{\huge \textsf{WELCOME! ^-^}}
@mchlnix
Take the time to check out the FAQ and GUIDE if you haven’t already.
There’s also a lot of good stuff on the forum to help you, like:
The Ultimate Guide for WK
The Ultimate Additional Japanese Resources List!
The New And Improved List Of API and Third Party Apps
I hope your Japanese learning journey goes well and that you enjoy your time with us on the forums.
—————————————————————————
I could type out a long response, but thankfully @MegaZeroX has already done the work here: There is no such thing as cheating yourself in SRS
Essentially though, no, there’s no harm. Wanikani’s SRS is the most efficient way to learn, requiring the least amount of time put in, but there’s no harm in studying externally or doing other SRS systems.
Personally, I put failed items in to a separate SRS deck in Kitsun.io so that I can double reinforce, for example 