You could always do site-based adventuring, I suppose, like in the old days, but that market is well served by the modern OSR scene, and the reason that the mainstream trad scene isn't into that is because they were never really satisfied with that type of adventure in the first place. They want the game to feel more like a fantasy novel or movie and less like a fantasy-themed exploratory board game or wargame or whatever... but honestly, the trad playstyle has never cracked the code in terms of how you write adventures in a way that doesn't come across as a railroad. So GMs who are trad style but you don't like railroads have to pretty radically alter how they actually run adventures quite often, or at least be willing to in the event that, as you say, the PCs refuse to do what they're assumed to do for whatever reason.