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I would argue this is barely the default these days. Windows, OS X, and on the Linux side network-manager, dhcpcd, systemd-networkd etc all have privacy address

I would argue this is barely the default these days. Windows, OS X, and on the Linux side network-manager, dhcpcd, systemd-networkd etc all have privacy addresses enabled by default. Many OSs/distros also have RFC7217-style addresses enabled by default too, so even the SLAAC base address doesn't contain the MAC on those. DHCPv6 does actually implement temporary addresses too. Support for that is legitimately rare though.

usr1106 6y ago
> on the Linux side network-manager, dhcpcd, systemd-networkd etc all have privacy addresses enabled by default. There used to be a bug though that it only works for hotplugged interface cards, not for coldplugged ones (present during boot already). Don't know when it got fixed exactly, but I have one Ubuntu 16.04 machine (even with HWE kernel) and it still has the bug.