Just look at all of these exercises variations! These can all be easily manipulated with things like tempo, pauses, range adjustments, and 1 and 1/2 or 1 and 1/4 reps. A Bodybuilding Deadlift is very different to a Weightlifting Deadlift and THAT is also very different to a Powerlifting Deadlift.
The position for the first 3 deadlifts varies depending on a person’s goal, program, size, and levers. This will dictate start, mid and end position. How these exercises are used in programs is dependent on the client and their needs. Are they hypertrophy based, performance based or strength based?
MY TWO CENTS ON THE HIP HINGE:
a) It taxes the nervous system more than any other movement
b) It is normally done poorly due to weakness usually through hamstring muscles
c) Unlocking your hip flexors, activating your glutes and mobilising your spine will improve your lifts
Get to work!