Or why shouldn't anyone hiking the AT do it in any style they want? And people do. I see FKT types exactly like Carrying A Tuba types and Let's Go Barefoot types and other gimmicks.
Fastest Known Time hikes are gimmicks. Why not do the same thing wearing a pack that never goes below 100 lbs? And do it in record time? Or how about rolling an upright piano the whole way? How about hopping on one leg? Or walking it backwards?
FKT hikers need to do their hikes with no one knowing the final outcome, otherwise it becomes a howling fan club salivating over their pathetic progress and keeping track of their every move and how many miles they went from day to day. Encouraging FKT records by us the public keeps this lunacy going. Let's pull the plug on these extreme athletes and get them and their entourage off the AT. Instead, let's see how fast they can hike from Florida to California on the shoulder of the Eisenhower Interstate Highway system. Or speed walk around the inside of the Mall of the Americas and in 40 days get their mileage numbers.