Because its not a manufacturing defect.
The reason this problem occurs with Fox forks is due to lack of maintenance. Mojo cant replace every CSU free of charge because the idiot who owns the forks couldnt be arsed to clean them when they were meant to.
Where does manufacturing defect end and ‘unfit for purpose’ start.
On the basis that Marzocchi, Rockshox, don’t suffer anywhere near as much as it seems Fox do, and also given that Fox apparently didn’t have these issues in the past, I’d say it’s either a significant design flaw / substandard speccing of the coating or coating process. Hence unfit for purpose.
Alternatively, the design and coating spec has been adequately specified but something has gone badly wrong on the manufacture. Hence a manufacturing defect.
Why doesn’t someone issue a small claims writ on this for one or the other and see what the SCC would think of it?
[Interesting that some people seem tolerant to this yet when other manufacturers making for sake of argument ‘consumables’ encountered manufacturing defects and did warranty their returns they still got a hell of a blasting]