While there are many books for systems based around pulp adventure, HEX is probably the biggest individual game for that genre. Do you think this game fully represents the pulp genre just like D&D represents fantasy?
HEX is a very fun game but the setting is only one of many possibilities for pulp gaming.
In a similar fashion, D&D does not represent "fantasy". D&D represents some popular aspects of fantasy along with certain trappings that are either unique to D&D or became fantasy staples largely because of D&D.
From a popularity standpoint you might have something.
HEX is a great game for a variety of pulp-style adventures.
I've run it in the default setting, I've run adventures against the Nazis on the surface, and I used it to run an alt-1930s airship game that was a cross-pollination of Film Noir and Firefly using real-world zeppelins.
I think that like D&D, it's known for one thing, but it's a very flexible system that can be put to a LOT of uses.
This may get me strung up around here (heh), but I prefer it to Savage Worlds for my homebrewing needs.