> Just to clarify, this requires Mac OS 26 Tahoe for "container" doesn't it?

Yes’n’t: https://github.com/apple/container/blob/main/docs/technical-...

> container relies on the new features and enhancements present in macOS 26. You can run container on macOS 15, but you will need to be aware of some user experience and functional limitations. There is no plan to address issues found with macOS 15 that cannot be reproduced on macOS 26.

The issues are around networking.