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Launcher3 is a very positive example where the open source app is well maintained and serves as the basis for Google's launcher and those implemented by various other vendors. There are not many bundled apps in AOSP and several are very unnecessary and should just be removed.
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Calendar, Music and QuickSearchBox are only still included because they provide standard functionality that's required for app compatibility. However, they're abandoned and have been stripped down to minimal sample apps. In some cases, they stripped down the compatibility tests.
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For example, AOSP used to have a primitive text-to-speech implementation via PicoTTS. It was unmaintained and never worked properly on 64-bit unless it was built as a 32-bit app, and having unmaintained, sketchy native code exposed to untrusted input is also a scary prospect.
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