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Adding support for the Pixel 4a and 4a XL would require device maintainers to implement and maintain support for it, which is a long-term commitment involving a lot of ongoing work. Pixel 4 and 4 XL are supported because there's a maintainer.
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If someone steps up to work on Pixel 4a support, they'll be working on the Android 11 branch, so their initial work would have to be helping with completing the bare minimum port of GrapheneOS to Android 11. It's a lot easier to do the porting with existing supported devices.
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