Yep, agree (almost) totally.

I know of colleagues who essentially set-out to scare the pants off patients so they won't have a chance of dislocating. What you've got to ask yourself is where the evidence comes from that says that after a certain period of time, an activity will be 'safe'. Essentially, as long as a patient is sensbile and doesn't do sudden movements of, say, flexion way beyond 90 degrees with rotation, they will almost certainlt be okay.

The only caveat to this is what the OS finds when they operate. Get them to document on their op notes what range they got on the table post-op. If they only get 100 degrees of flexion before the femur starts to get levered out of joint by contact of the neck of femur on bony rim of the acetabulum / pelvis, then 100 degrees would be a strict maximum amount of range.