Us designers are silly. All of our dreams are to shoot explosive kitties (Of course don't really blow anything up. ) from our faces and have them all rain down upon our enemies. I mean /hat /back and /home is about the only things we ever use. Some of us have always wanted /kittycannon.
Plus people make massive WE changes every second. Saying /kittycannon would crash the game is an understatement.
Clientside it is pretty harmless indeed, but I'm pretty sure Nat stated that it cause lag for the server. Especially if people have it keybound. Not /kittycannon itself, but commands in general.
I agree im just saying some people dont have very good computers and there have bin the same command on different servers and they had to ban it for lag.
If it were to be added, a possible 10 second cooldown or something on it would fix any lag it causes.