The theory was formulated in the 1960s and 1970s as new information was obtained about the nature of the ocean floor, Earth's ancient magnetism, the distribution of volcanoes and earthquakes, the flow of heat from Earth's interior, and the worldwide distribution of plant and animal fossils.
The fact is loose control arm or track bar bushings can contribute to death wobble. Bent, or loose bolts, wallowed out mounting holes, and bent control arms can also contribute to your Jeep catching the shakes. To prevent this, keep an eye on your control arms and track bar.
Mis-torqued lug nuts, bent wheel, out-of-balanced tire are all causes of shakes when braking. Unless I missed it in your presentation and one of the most important tasks to prevent brake chatter or vibration would be to torque all the bolts including the wheel bolts. If the bolts holding the wheels to the hubs are not properly torqued they will cause vibration when you apply your brakes.