If anything, fatigue in composites is more of a gradual widespread degradation, which could potentially get noticed, then a localized crack appearing and spreading until the whole thing falls catastrophically which is how metals die out of fatigue.
The high profile catastrophic CF steerer failures have generally been a consequence of engineering blunders (associated with more, let's say avant-garde designs) or user error (overtightening with too much spacer above the stem leading to clamping unsupported carbon fiber as the compression plug isn't long enough). A conventional CF fork where the manufacturer isn't trying anything weird is a well proven design.
Last edited by Branko D; 11-11-22 at 02:01 AM.