This is similar to the adventures produced in 4E. It was a big departure in gameplay expectations, yet the adventure series they produced (the only in-print one they managed - the one that started with Keep on the Shadowfell) was written in the style of older editions. It was a flop, it is universally reviled, and probably was a factor in why 4E failed.
A stellar opening campaign/adventure is critical for the launch of a new edition, especially one with little backwards compatibility. Hoard of the Dragon Queen wasn't great by many opinions, but at least there was the solid Lost Mines of Phandelver.
I don't know if any official adventures or APs for PF2 are any better, but the Playtest was bad, the Demo adventure is horribly imbalanced, and the two adventures I've run from Age of Ashes show a weakness of design that doesn't support the gameplay.
Coming strong out of the gate with an adventure that really showed what the system could do that was written in the style that isn't just a Paizo-standard based off PF1, would have really promoted the system.
A comparison would be the release of a new video game console. The only games available are ones originally designed for the PS4, for example. But every time you load the game into your PS5, it stutters and crashes.