Not relying on preservation of xatrs would be a gentoo.git tree policy.

If such policy is created, new QA check file would belong in
gentoo.git repository in metadata/install-qa-check.d directory, not in
Portage repository.
(And there is no need to delete any xattr-related code in Portage in future.)

Creation of such policy would need discussion on gentoo-dev mailing
list and/or formal vote in QA team.

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