That is actually kind of the point I was getting at. It doesn't matter. 
Nobody using this app will feel uncomfortable when confronted with ```tippt``` instead of ```schreibt``` nor will anyone not know that the other person is composing a message, typing, or writing. People wont have problems switching from wa to telegram because of this.

But if you really want to argue which one is more suitable then ```schreiben``` is rather related to pen and paper while ```tippen``` is the act of using your finger to input something into a device. Now the latter seems more appropriate for what I care as long as the user is not using a pen input device ;)

As I don't want to flood the inboxes of people subscribed to this request, I'd rather stop the discussion here and hope you agree :)