Some of them are programming languages.
Also a touchscreen can not be operated with sweaty fingers or slightly unusual conditions.
No they really can not be reliably used, recent years’ improvements notwithstanding.
If I ever need to use my phone in an emergency outside in the cold with wet, sweaty perhaps bloody hands, I’d appreciate a 100% physical keyboard controllable one.
Touchscreens are handy though as an auxiliary control in the ideal circumstances.