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Their exploit is only for Android 8-9 since they say exploiting Android 10 is harder so there's already a catch before GrapheneOS hardening comes into play. If you want to pay a security researcher to revert fixes for old vulnerabilities and analyze impact of hardening, go ahead.
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It targets devices offering the best privacy/security and is ultimately meant to focus on custom hardware. Broad device support isn't possible due to most devices not meeting the requirements and isn't wanted. Not meant to be something flashed on whatever people happen to have.
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