He probably meant a prehensile one. You can't wipe bupkis with a squirrel tail.
It can bend! Then again would you want to walk around with your tail full of your own shit? I think not.
A Saiyan tail could get toilet paper, wipe, and throw it away without the Saiyan having to do so much as lifting a finger...or a cheek, for that matter.
I'd put up with the potential of someone grabbing it and making me vulnerable for that.