Years ago I set an iOS text replacement to replace “duck” with “fuck” because I was tired of fighting the prediction. Anyway that’s all well and good until you tell someone that in all their photos they have fuck lips
You can also add text replacement rules for the shit it tries to stomp on, so that the word is "replaced" by itself. These days, I use this even more to prevent it from capitalizing things I don't usually want capitalized (simple words that it assumes are proper names, religious characters, etc.)