Not necessarily. For a 'lone wolf' project that might be the case, but some projects have public mailing-list archives, e.g. https://lists.gnu.org/archive/html/lightning/
I think it would be necessary to do some manual copy+pasting, or else use custom scripts/tooling, to turn such mailing-list archive pages into patch files (for git apply) or mbox files (for git am).
Not necessarily. For a 'lone wolf' project that might be the case, but some projects have public mailing-list archives, e.g. https://lists.gnu.org/archive/html/lightning/
I think it would be necessary to do some manual copy+pasting, or else use custom scripts/tooling, to turn such mailing-list archive pages into patch files (for git apply) or mbox files (for git am).