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odd that there's nothing out there mass-produced, compared to the stacks of steel forks
Steel forks are cheaper than carbon.
There are some mass produced welded steel quill stems on Alibaba, but even there the saving compared with a forged aluminium AHead stem is of the order of $0.50. That matters when it's the difference between $0.50 and $1.00, but of no interest to bike manufacturers once they start targeting the >$100 RRP price point for a complete bicycle :-)
That is somewhat surprising. Still odd that there's nothing out there mass-produced, compared to the stacks of steel forks