that's because there are tons of ways how to smudge.
tons of different results as well!! there isn't a tag that i make that hasn't smudge in it....
only sometimes i use it to soften (blur) or make a flow... sometimes to smooth things, and sometimes i use it as the main effect.
mostly i use smudge without scatter, but if treated carefully some sattering can give beautifull results.... it just depends to what you want to obtain....
if you want to know how i do my smudging, just pm me.... :)
