There's a new section in the GrapheneOS FAQ covering disk encryption:
grapheneos.org/faq#encryption
Other than GrapheneOS allowing ending user sessions and raising the padding size, this also applies to AOSP on devices with a secure element offering Weaver like the Pixel 2 and later.
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See grapheneos.org/faq#device-sup.
In the future, we plan to have a hardware partner producing phones meeting and exceeding the security standards of Pixels.
Pixels currently offer the best security and we haven't yet found any other devices meeting even the most basic requirements.
As explained in the FAQ, broad device support is explicitly not a goal and would be counter to project's purpose. It only makes sense to support devices meeting the privacy and security requirements. Most don't even have full security updates or verified boot for a non-stock OS.