I maintain that one of the pinnacles of privacy is the written word, more specifically, the handwritten letter.
Very hard to silence, censor etc. Especially if delivered outside the postal system.
face to face is my go to
"Who needs face to face when we can just text, am I right? 🤷♀️ #IntrovertLife"
4 the real important ffs
Face to face, phones off not in the vicinity.
Use a typewriter to resist handwriting correlation attacks too :P
I mean, I guess so. I can't think of many situations where I might do that but if you didn't want any possible interceptors to know who sent it, sure.
I wouldn't consider it "written" though.