well excuse you, but I have and that's how I was taught
what was the car? you're gonna need to have a relatively powerful engine to allow you to get to the biting point (and for the car to hold there) without any gas. and if you don't use the handbrake whatsoever you would most certainly get failed in your test. i admit, using the handbrake at every small incline is annoying, and if you know what you are doing you can ride the clutch. it's a habit you want to avoid when learning tho.
the transition period between the foot brake and the gas pedal will definitely be enough for the car to rollback provided it doesn't have a hill holder. if you're quick and know exactly what you're doing the rollback will be minimal, but honestly pls just use the hand brake if you're learning.