I also think cine lenses have the budget to continue making high quality mechanical interfaces. Consumer lenses must have AF and so are incentivized to reuse that functionality if it would reduce the BoM.

A large focus throw and more importantly, focus consistency, is paramount for cinema lenses. When you rack focus, the lens needs to show the same field of view every time, no questions asked. The early red pro cinema lenses had a design flaw where the focus rings would come loose over time and ruin shots. Someone clearly forgot the threadlocker.