Several APs, such Rime of the Frostmaiden and call of the Netherdeep try to do something about that, but there is only so much an author can do when they can’t read the PC’s backstories.
Perhaps they should print “this is only an outline, the GM is expected to add material of personal relevance to the PCs” in giant block capitals on the cover?
Something I intend to do for my game is introducing what I've dubbed the "Campaign Builder". With the way my Questing system works (ie, living world that will readily act on its own), its capable of delivering conventional AP-like storylines without infringing on the pure sandbox of the game, but also while not cheapening the idea of the living world.
To that end the Campaign Builder is not only a setting book, more or less, but also serves as a way for Keepers to begin populating the world and timeline with ongoing events and happenings, with support for all of these to tailor them to any level of player involvement.
A lot of what makes that work is the idea that the gameworld can solve its own problems if the players don't want to, and that agency can only be real if failure and/or missing out is possible. This is also why in terms of character development that PCs can be absurdly powerful relative to the typical RPG PC, as if you can command 10,000 Skeletons you're probably going to want to go conquer something, and not sit in a cave just making more Skeletons (though they wouldn't be the only ones who chose to do just that

As a matter of fact, even those that opt to simply become bakers will find themselves in the thick of it eventually unless they actively pack up shop and leave everytime something starts to happen around them. And thats assuming they luck out and don't get drawn into something just as a result of supporting their Bakery.
While from one perspective a lot of the games heavy integration between all of its systems can be a bit pushy, from another, the players are a part of the gameworld, and like everyone else in it they can't trust that the Big Bad will just sit around forever waiting for the real life humans to decide to do something.
Other Heroes will rise, instead, and may be, they'll come buy a muffin one day, and tell you the tale. Either way, its a wonderful story being created.