^^^
That was my immediate question as well-- I can get a full year out of a front tire, with 10,000 miles split between two bikes. I got 13 months and 5,800 miles out of a 700x35, and the front 700x25 on the road bike was mounted last June, a good ways past 4,000 on it.
But I know what I'm doing, so mounting/unmounting a tubeless tire is never really a bother. And it's "clean mess" vs. "dirty mess." A little latex on the shop floor isn't going to kill anyone.
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