Yeah, right. I tried my back brake only for a while, then switched to using both. I immediately noticed the rear wheel would always slide to the left when I hit the back brake, though I just went with it since I didn't fall. I switched to the front brake after I learned to brace against the handlebars before braking.

I've had one emergency panic stop, which was when some wench in a minivan stared me down as I approached (at 20mph) and then turned dead in front of me. She actually sat stopped for several seconds, I made eye contact to make sure she saw me, she just watched until I got close and then turned in front. Hit my front brake, knew I shouldn't, knew it'd end bad... grabbed my rear brake too in a panic. Bike immediately goes sideways and dumps me under it.

Not doing that. Back brake is for when the front brake is not useful, not for general use.