For existing apps, failure to update by the Play Store deadline (November 2020 / August 2021) would block new releases. For new projects, API 29 is the to ensure compatibility with Android 11, 12, and beyond.
The Android 10 SDK wasn't just an incremental update; it was a paradigm shift. It forced developers to adapt to transparent system bars, respect user privacy boundaries, and design for fluid gestures. android 10 sdk