I just posted this in the Arkose thread, a few bikes use the same hanger so they were inclued on the list –
“It’s a ‘to be sure’ replacement. There’s some dropouts that haven’t been machined properly and when we looked at the possible affects of that in combination with a maybe a looser QR it answered why we’d had rear wheel moving in the dropouts reported, so it’s been acted on.
We decided to replace all dropouts because although we can trace frames by batch the dropout inserts aren’t supplied or made 1:1 with frames as it’s a part that other brands/frames use also.
I don’t want to undermine the recommendation not to ride the bike until it’s swapped out but for perspective if you’ve been riding it for a while with no issues it’s unlikely there is an issue, just to be clear and confident moving forwards we felt it best to get them all replaced and not to have to make judgement calls on the part detail. Apologies for any inconvenience though.”