And if you’re training it on your own writing, why do you even need it? A machine that mimics your writing seems like the definition of useless.
Tone management. Type out what I want to say, feed it to the machine and have it turn up or down the condescending factor for example.
If spelling and grammar checkers are your proofreaders, AI can be your editor. One double checks what you wrote for technical errors, the other checks your attitude.