I am not sure how gear would affect ROM, I will leave that to the gear experts here....
Phil Heath has taken on the approach of Ronnie and does not use full range on most exercises. But I agree, everyone needs to work within their OWN ROM and what will hit the target muscle with the most intesity and without causing injury.
Case in point, I used be a stickler for full arm extension on preachers, rev grip pulldowns and bar curls. Over the years, my bicep tendon became very strained so now I have to use a shorter ROM to take pressure off the tendon. Results have been awesome because I can lift pain free! Bis are the biggest they have ever been.
Keep in mind with regards to newbie trainees that a lot of the shaking and floundering with free weights has to do with their nervous system getting used to the exercises/form as well as the muscles, tendons and ligaments.
And light to Ronnie is brutally heavy to most others!!