I have driven manual until mu EV and I don’t understand the hill start problem/question.

leave it in gear and it might not roll turn wheels so it wedges against the curb.

The rest can be done with footwork a d sensitivity. My uncle always wanted the emergency brake working for when the brakes would fail.

That was driving until the mid to late 70’s.

Hillstart problem is when you're pointed uphill, stopped, and need to start going. Without the handbrake, the car will fall backwards when you lift off the brake. So you'll need to be good at working the clutch, or use your heel and toe on the gas and brake at the same time, or risk going backwards into the car behind you.