I use both, nearly all the time.

I have about a km on my commute that if it is wet, it is very slippery. Then I take my fingers off the front brake.

If you are only using your back brake you have doubled your stopping distance.

Back brake use wont stop an endo if you use the front brake. If you lift your rear tyre just a tiny bit off the road, then it doesnt make any difference if the back brake is on or off.

I am 80 kg, and have never done an endo, but have come very close.

Most emergency braking for me has the back locked up and skidding, not because I have too much on it, but because my front is stopping so hard that all the weight goes onto the front, and comes off the back. Less weight on the back, less frictional force.

If you dont use the front brake, I suggest you start, it could save your life. If you go fast then you really need to do this.

z