As written, basically after every fight with an Oni, you just do a Ritual of Cleansing and remove all (or just one?) Afflicted stati and are fine. No taint ever happens. Same goes with a Monk who just keeps spamming Cleansing Kiho until he bursts.
How does anyone ever get tainted unless they are 2 weeks away from the next person with access to Rituals and a working brain? How doesnt every Hida, every crab samurai have Ritual of Cleansing?
Am I missing some way to get tainted that isnt easily removed by this?