Gmail still explicitly permits anyone to send spoofed emails from Gmail users via their p=none DMARC policy. When is this going to be fixed? It's long overdue. To confirm `drill _dmarc.gmail.com TXT`.
"v=DMARC1; p=none; sp=quarantine; rua=mailto:mailauth-reports@google.com"
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No, it doesn't. It only breaks mailing lists spoofing emails. As long as the mailing list only adds headers like List-Unsubscribe, the DKIM signature remains valid and it passes DMARC verification. Only misconfigured mailing lists would be broken, and they already are broken.
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Don't send emails falsely claiming to originate from another address and it's not an issue... that's the feature working as intended, and as it should work. It shouldn't be possible to send spoofed mail whether or not it's a mailing list. Not at all needed to have a working list.
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What mailing list do you use that's still broken with DMARC in 2020? Mailing list software was updated to deal with this a long time ago. You don't seem to be up-to-date with the status quo. You're talking about it as if it's still years ago and the software is still broken.
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Perhaps they should update to address serious security vulnerabilities and other bugs if they really haven't updated their mailing list software in that long. You'd need to explicitly configure mailman, etc. to break this by tampering with emails without mangling From address.