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They have other uses too - people with limited mobility can use them to get onto bikes easier - when I was hit by the car from behind, trying to ride again I couldn't lift my leg over the bike, I'd have to lean the bike right over so I could clear the saddle. It never even crossed my mind that a dropper could've helped. I only used one for the first time very recently on a borrowed MTB and it was more to adjust the saddle height than any 'shredding' but a bunch of times on the gravel bike I've wished for one.
Yeah, but remember when the same thing was being said when they were introduced in the MTB world years ago? Now people can't live without them.
I think they'll come to serve a purpose on no identity gravel bikes, case in point, @hippy would have found one useful as would many people on long rides that aren't about shredding.
I know I could do with one on the chunky tourer. Albeit not 800 fucking quid.