patch-2.7 introduced support for git-formatted patches, which are very common in the wild.
Yes, presumably it is better to introduce this feature in a well defined way.
As patch-2.7.5 is stable, I don't see any obstacle for adding this to EAPI 7.
The bug has been referenced in the following commit(s):
Author: Michał Górny <email@example.com>
AuthorDate: 2017-09-28 17:50:56 +0000
Commit: Ulrich Müller <firstname.lastname@example.org>
CommitDate: 2018-03-31 15:30:43 +0000
EAPI 7 requires GNU patch 2.7.
commands.tex | 13 ++++++++-----
eapi-differences.tex | 4 ++++
2 files changed, 12 insertions(+), 5 deletions(-)}