I almost always use my handbrake to hold the car when I'm stopped on a upwards slope in a manual car, and sometimes in autos as well (habit, especially on steeper grades). Using the handbrake also means that I don't have to drain the battery on brake lights when the engine is off at a long light, though I do leave my foot on the brake until at least one car has completely stopped behind me.
Watching cars trying to do non-handbrake hill starts on a steep road during heavy rain is rather entertaining. I think "drying the road with my wheel spin" is the best way of describing it. Luckily when I've seen this, people have had the sense to leave room in front of them when they stopped, otherwise there would've been heaps of accidents with cars going back when they lost traction.
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