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That's new, thank you for that. I worry that since it's "developer" it may not be supported in future releases.

Edit: it resets that setting after Safari updates apparently.

defaults write -g WebKitExperimentalIsFirstPartyWebsiteDataRemovalDisabled -bool true

If you set it in the global defaults, then Safari won't touch it.

Definitely not for normal users, with an override that requires a terminal command.