You are correct. Ford always had the radius rods on their cars go back to a single pivot point
under the transmission. This was also done on Fordson tractors, (except Dextas) and most other tractors. This is kinematically correct.
By spreading the radius rods to the sides of the tractor, you introduce a twist, which could be taken up by bending of the radius rods, or by torsion in the front axle. In hotrods, you see the extreme of this when the radius rods are spread out to the sides of the frame. Luckily, steel has a high tensile strength (or elasticity) which allows it to snap back after being deformed. Over time, the fatigue stress may induce cracks, but they didn't expect anyone to be worried about that 50 years later.
I expect that they did a lot of testing to see whether the design held up, or if they needed more elastic alloys. The other approach would be to sell low-cost replacements from time to time to keep the tractor in service.