What the eye doesn't see

We all know why the front end of a motor has to be jacked up in the correct place. Well the back end, with certain suspension configurations is no different from the front however the only requirement is to ideally leave the suspension free-to-hang (i.e. extended).
I posted on the Mercedes M-Class rear susp. ball joints previously (can’t find it, might have been on the other forum) anyway, I said how no wear was detectable when jacked up as per the IM and in order to reveal said play, they needed jacking under the wish-bone (type) arms and use heel-bar. Remember? No, ah well.
Here’s the point.
Tested a contemporary Range Rover last week but I couldn’t drop the rear suspension as per normal so I jacked it on the lower arms and, as I always do, used the heel bar. Could not believe the play revealed in both-sides lower arms outer bushes. Honestly don’t think this would have been visible jacking in the prescribed manner as everything in question would have ‘tightened-up’. Foreman said “that’s a fail” and he could well have been right, but I P&A’d as the bushes were at the rear and fail-safe and I could hear no metal-to-metal contact. Just makes you wonder what else is not revealed on modern multi-link back ends.
In hind sight, had I thought about it at the time, I would have liked to have road tested it just to see if such a large amount of play was evident/audible during driving.
Perhaps some of you Landrover experts can comment?
Cheers.