Welcome to Cake, @anna0X 🙂
Over time, I seem to have adapted to Smart Compose in the same way you have. I dunno if polite is quite the word for me, although that's part of it. I am looking for fun & upbeat replies to email and I'm surprised at how often the suggestions are close enough that I can just hit the tab key.
I was very worried about coming off as canned & corporate but the suggestions are surprisingly good. Does anyone know if it learns from your writing style to make its suggestions?