With the exception of Hoh, all the systems you mentioned have integrated hatchery programs that allow and encourage the mixing of hatch and wild on the gravel.

(H x H) and (H x W) crosses regularly occur on the gravel. The gravel-borne juveniles from those pairings are WILD. Not because I said so, but because they are by definition wild-borne. Those fish will be subjected to the unrelenting selection pressures of the natural world.... their ability to effectively forage in the wild and evade predators in the wild ultimately determine their true fitness. The weak and unfit will be naturally weeded out. But what comes back to spawn from that brood is a genuine WILD product, whether you choose to believe it or not. If the bloodline of the hatchery-raised parents originated in the basin, it is NATIVE as well, regardless of whether you choose to believe it or not. Even if that returning adult is the product of a (H x H) pairing, it's a WILD NATIVE spawner that has proven its genetic fitness. If you could somehow follow the original DNA trail and gene flow, it's the same fish that would have survived to reproductive adulthood had the bloodline never been subjected to a hatchery environment.

The point you fail to grasp is that a returning WILD fish is the product of natural refinement of its original brood through EVERY life-stage. Essentially only the best of the best survive.... with the minor exception of an infinitesimally small handful of EXCEEDINGLY lucky fuktard fish.

A returning hatchery fish, even if it's parents were 100% wild, is not subjected to that same level of natural "refinement" at every stage of its life cycle. A large proportion of misfit fuktards that would have been incapable of surviving the egg-to-smolt portion of their life cycle in the wild were artificially coddled past that challenge. When those fish spawn, they pass on the genes that code for the egg-to-smolt fuktard that CAN'T survive in the wild. It becomes a genetic dead-end before the next generation makes it out to sea.