Cars have had that feature ("hill hold assist") for 20+ years now. Even longer for high-end models. There can't be all that many vehicles left on the road that don't have it.

Besides, you could make such an argument for any safety feature: "I don't like how new cars have ABS brakes. We shouldn't be training people that you can just slam on the brakes on a slippery surface and expect the wheels to not lock up..."

... "I don't like how new cars have seatbelts. We shouldn't train people that they can just crash into things and not have their face go through the windshield"...