For me the issue has been procrastinating on some non-Japanese tasks to do with my separation/divorce, and some of my stress/anxiety-related ticks have been cropping up again. That procrastinating then spilled over into my Japanese studies.
I was forthright about it all with my therapist last week and committed to getting two of the longest-put-off items done before I see him again, and the lesser things have been swept up in the growing tide of productivity.
I do agree with you about the freedom of not having that SRS commitment everyday, usually multiple times a day, though, totally! I loved Kitsun.io but do not foresee using it again until WK reviews are down to once a day (a month or so past finishing lvl 60 lessons, perhaps).
With me being back to being a student from end of February, I figured I’d need to be studying daily anyway, so a bit of WK in there won’t make much of a difference 
How are your studies going?
Oh, and speaking of my being more productive, I can finally post one of these again: