I'm not really sure which is which...Glad you posted that "ancestor". It graphically shows the difference between aftermarket T&T and a properly engineered vehicle.
The AEV (Nth Degree suspension) in front is designed to accept up to 1500 lbs over stock, the rear J8 military suspension in the rear is also designed to accommodate the weight, plus Nth degree relocates the track bar for an improved roll center. It's likely, that in spite of the weight, it handles better than a stock JK.I'm not really sure which is which...
The vintage Jeep has a considerable amount of stuff in front of the front bumper, drastically reducing the approach angle, but seemingly weight-balancing to offset the weight of the fluid tank over/behind the rear axle.
The AEV or whatever aftermarket modern one has little to no modifications up front to maintain the approach angle, but with so much expected weight in gear now has leaf springs in the back, and presumably has much different handling characteristics compared to stock with so much rear axle weight.