That's a great idea. I was an early Anki contributor and ended up wasting a lot of time with SRS. Basically every language blogger I knew in 2008 was obsessed with it.
If I were to go back and learn Japanese again, (which I may do since I haven't spoken it in 20 years), I'd use Anki for the following:
- drilling the sounds, single syllables, 2-3 syllables, and identifying pitch accents in sentences
- relearning hiragana and katakana
After that initial phase, I'd probably make the core of my practice listening to podcasts for foreign learners while reading the transcripts at home and then re-listening to those same podcasts later while outside for practice. It's way easier and more helpful to recall words in a context you already understand.
I'd also use Anki for learning kanji if I hadn't spent years reading traditional Chinese. Since I have that background and Japanese character simplifications were so modest, I think I'd just read some audio books while listening to the audio and see if I could figure out all the kanji from context. TV series are also great once you can access them because they tend to use similar vocabulary and revisit similar throughout a season arc.