The Lambert fork broke not because of the material it was made of but but because of the
way it was made.
It was
cast aluminum. The steerer was press fit or pinned to the crown. They were all recalled.
I agree that there are some sweet riding steel forks - I own a Tange Prestige replica of a 3Rensho fork with LC21 crown and the ride is amazing. I also own a 2017 Niner carbon fork which is revered in the MTB and gravel/adventure world.
Sorry to hear that someone was hurt and even more so that there were long term consequences but I don't see the wisdom in basing 2017 decision on what to ride on poor design and manufacturing from the mid 70's.
-Tim-