It feels like most answers could be paraphrased as “Writing is more studying so you’ll know them better”, which is kind of obvious.
Imo the question should be:
Do you want to be able to read x amount of Kanji, or do you want to be able to write y amount of Kanji?
I dare say x is always going to be bigger than y.
If you dont want to learn handwriting, why bother? Spend the extra time on exposure and you should be able to read them just fine.
It seems the “quantity over quality”-mindset in terms of reading is the very core of WaniKani.