With the new iPhone Duo, Apple is taking a software gamble requiring apps to be recompiled for iOS 27.0+ to use the larger inner display and unique UI components like the new tab bar. Developers must rebuild apps to support Duo-specific features, risking many apps appearing with black bars if not updated. Apple chose not to enable iPad app resizing compatibility, fearing it would make the Duo feel like generic Android foldables and undermine its intuitive, carefully designed interface.

While split-screen may mitigate some issues, mobile gaming could suffer without full-screen optimization. The move also pressures developers to adopt Liquid Glass, potentially delaying updates. Apple may add iPad compatibility mode in iOS 28 if early adoption lags.

Despite concerns, the author remains excited for the Duo, acknowledging the short-term risk for long-term innovation.