I'm not emptying the cmdLine on purpose, I often have to send the same command several times. E.g when making new NPCs I have to edit the position/rotation and use "reloadNpc" several times (because of the interpolation) between each change to make it just right. I can end up sending hundreds of reloadNpc in a couple of minutes.
And it's way easier to just spam <enter> and do CTRL-A <BACKSPACE> when I'm done than it is to copy paste again and again because the server erases the command line every time I submit it.