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but it also a bit anecdotal
As is the vast majority of the "alu forks are too stiff" thing - in terms of pure material physics, aluminium has less stiffness than steel. ;-)
I think bicycle engineering and aluminium forks have moved on greatly from the early days of manufacturers overbuilding for strength, and thus ending up with very stiff frames. Genesis used an aluminium fork recently for one of their Longitude or Latitude models (I forget which), and that didn't seem to cause people any great problems.As to Stu's credentials, I don't know him personally, but he runs what's probably the most popular off-road bikepacking events (Bear Bones 200, Welsh Ride Thing, the Winter Event) and website in the UK, he lives in mid-Wales, and rides bikes a lot. I'd take his opinion over a regurgitated press release in Cycling Weakly or the like.
A common experience among cyclists, but Stu from Bearbones reckons it may not be an issue on the Frontier:
http://bearbonesbikepacking.blogspot.com/2017/07/sonder-frontier-tried-and-tested.html#!/2017/07/sonder-frontier-tried-and-tested.html