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Sometimes, if one reads internet sources, it seems they have a habit of copying and pasting material from other internet sources. Basically, people writing about subjects they don't know.
Some concepts are touted as the next big thing in cycling but that doesn't always translate into adoption on a wide scale. Touring is one of those genres that is slow to adopt so things like belt drives, tubeless, hydraulic etc... while having some place in modern cycling, may take longer to popularize, if at all.
If something is proven to work it will probably work again. Trying something new has the potential risk of ruining a tour, not just an afternoon ride.