AUI was still very much alive with XAUI[0] during the 10Gbps era!

If you're willing to be a little bit more flexible, the MAC-to-PHY distinction never really went away with the various MII generations: every speed from 10Mbps to 10Gbps is available using more-or-less the same interface.

[0]: https://en.wikipedia.org/wiki/XAUI

[1]: https://en.wikipedia.org/wiki/Media-independent_interface