I believe you are right - the ingenuity of a select team of pacific northwest flyfisher most likely preceded the wave of flyfishermen on the striper coast for a number of reasons. First, the cutt - a salter trout, just a perfect quarry for a flyrod. Then the sound, a giant inland sea accomodating to the fly angler with seasonal surges of big ocean-fed salmon of 5 species. Why the stripping basket is said to have originated in the PNW as well.
The rate of adoption in the northeast has nevertheless exceeded that of the PNW probably due to the behavior of coho and chinook salmon during the migratory push, when a deep vee with downriggers skimming 60ft over 300 or more feet of water is going to do the deed all day for the weekend warrior.
Another factor that might have aided the rate of adoption here is the shore fishing. Stripers love to frequent the shoreline, where many salmon roam currents with no regard to the bottom structure.
In any case, I don't think that the legacy of striper fly tying is necessarily better than the saltwater flies legacy for the PNW, it's just that there are more percentages are at play.
Thanks for this opportunity Les!