Often, I copy long texts in the editor, in order to select only a small part, and then I must erase word for word, which is uncomfortable and wastes my time.
So:
I recommend putting an option to delete all the text at once when the text exceeds 6 lines in the text editor.
This option could be seen as an X above the send button, which would only appear when it exceeds 6 lines.
Que Something negative would be if, after writing enough, it was activated by accident, losing all the information.