Bob, can't imagine why that would be. Length of travel should have no bearing (no pun) on the wear factor for the synchros. I think people want there to be a "tradeoff" for the benefit they get from short shifting.
PS - the video linked below is pretty good, for being from the 1930s. Simplest explanation of synchros I've ever seen. They have another one regarding the rear differential on Hemmings that is also quite good.
Tech 101 – How manual transmission gears work | Hemmings Daily