What is wrong with CW and Morse code??
It can be tracked easily and surreptitiously , placed under scrutiny almost at will and jammed with the proper kit. Not bad it you’re not trying to hide, but if stealth or privacy is high on your priority list, don’t go that route.
Works fine, a bit slow, and you may be a sitting duck, depending on how clever the opposition is.
Change with the times and technology.
Caddis the Elder
Extremely low bandwidth. In this media-driven world, a picture is worth a thousand million words. One picture can foment a war, or end one. There is a place for low-bandwidth communications, but CW and Morse and PSK31 are never going to be able to send pictures.
Too few good OP’s.
Too slow, but reliable.