For whatever reason I specifically saw several reports of LeMond Zurich carbon forks failing when I was working on my LeMond after I picked it up. Always secondhand, heard it from a friend or at the LBS. I talked myself up to using the ~20 y/o carbon fork on the Buenos Aires for a while as it was a model down in the lineup from the Zurich and a more hefty fork model, who knows if it carried that heft where it would actually help durability or not. Other than a little riding initially, all my riding on the bike has been in 650b. I used the carbon fork at first for a while, but it was the limiting width so got swapped out eventually. Plenty of washboard and potholed riding with the carbon fork though.

Anyways I next went down the low trail slightly wider tire route, so I picked up an old steel Fuji fork to swap in. Then replaced this year with a Soma low trail fork. So now I'm a couple iterations away from the carbon fork. I've thought about going back to 700c and swapping those wheels to another bike. If I did that I'd use a decent chromed Tange Cr-Mo fork I picked up a while back. What got me thinking (after the fact) is the bike had some internal rust in the seat tube and BB when I got it, probably from being left out some, and while I didn't notice much in the steerer tube, it would've been subject to the same exposures (compromised? who knows). All that said, I bet the carbon fork would probably be fine, I've "inspected" it since and haven't found any external evidence which is worth almost nothing of course. But just not worth it to me with plenty of easily swapped options. YMMV