I know you are discussing Fords and that in many ways Chevs are different. On Chevs, the 2 flex line setup on the front axle was the early one and the 3 line was the later. There is a Chev Service Bulletin listing the parts and procedures to make the change. I suspect the change was due to the longer lines from frame to wheel cylinder getting snagged on brush or tire chains. Also, the early lines (at least on Chevs) were held up by an arrangement of clips and springs inside the wheel well. If this was damaged or deleted in use or servicing I think the chances of damage would have gone up dramatically.
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