Thanks for the clarification. I’ll file feedback, though I’m surprised this wasn’t considered a generally useful capability for third-party apps.
Curved windows are one of the most visible visionOS 27 changes, and many of us have been getting requests for them since Vision Pro launched. If they remain limited to Apple apps, developers will spend a lot of time explaining why we can’t support them.
Please consider this a strong request from at least one enthusiastic visionOS developer. 🙂