Android

Apps that run flawlessly during development exhibit performance issues on real mid-range Android devices. Causes include excessive widget rebuilds, unoptimized images, synchronous main-thread operations, and unclosed streams. Flutter's reactive nature amplifies these problems in poorly structured widget trees.

Rust doesn't offer out-of-the-box, first-class support for iOS and Android app development, limiting adoption for mobile-focused teams and forcing reliance on workarounds or alternative languages.

When Google or Apple release new OS updates with fresh features and APIs, Flutter typically takes time to integrate them. Flutter developers experience delayed access to new UI elements, platform APIs, and system-wide features compared to native developers.

SNI is only supported in TLS 1.x, not SSL 3.0. Additionally, older clients (MSIE on XP, Java 6, Android versions, and some programming languages) lack SNI support, causing certificate errors when multiple certificates are hosted on the same IP address.

Different platform design expectations (e.g., iOS bounce effect vs. Android glow effect) make it difficult to create a consistent Flutter UI across all three platforms, requiring custom conditional rendering logic.

Ubuntu's strategic focus on mobile devices is coming at the expense of desktop development. This prioritization is causing Ubuntu to make incompatible changes to foundational software and diverge from other Linux distributions, without realistic prospects of competing with Android.