The fact that everyone who isn’t a programmer or intense “fanboi” WP nerds needs onboarding help for block themes suggests block themes should still be in beta.

As should anything where tutorials contain sentences like “Simply open the JSON file in your favorite text editor and…”

From a professional app developer’s perspective it’s enough that FSE is easier than setting up for app development with SwiftUI or the Android SDK. But from the average actual WordPress site owner’s perspective maybe that’s not good enough.