Do you not understand that there is no point in a new trad game rules system unless it allows you to do somethings better than the rules youve already got?
And the best way to show, to teach those new somethings is via adventures?
Okay, so let's unpack this a little bit.
First, whether Daggerheart is a "trad" game is up for some debate. it has some narrative elements, but more importantly it comes out of the tradition of neo-trad play.
Second, a new game (of any sort) does not need to do something BETTER than the game you got, just something different. Daggerheart is definitely different than 5E in some key ways.
Finally, adventures aren't the only way to explain how a game works. Even so, you still don't have any evidence at all that Daggerheart will not have adventures available. My guess is that there will be at least one if not more free PDF adventures available at launch. And, for all i know (or you, for that matter) there is a starter adventure in the book.
But, none of that likely matters to you. You seem to have planted your flag and are unlikely to be moved. Congrats. You have saved yourself $60. Use it to buy an adventure, I guess.