[mxmlnkn]

The title seems misleading.

These are not errors. They are simply warnings about extended attributes being ignored when extracting files, which seems completely fine to me, and creating the tar without those extended attributes has exactly the same outcome, but throws away the metadata at archive time instead of extraction time.

Furthermore, this is not an Apple/macOS issue. The tool used is bsdtar, so it would also affect all BSD-variants that default to bsdtar/libarchive, and those systems also have extended attributes, e.g., for SELinux, which would get added to the TAR.

[nomel]

It's unfortunate there was never a standardization around how to print different "levels" of messages. Imagine how nice things could be if we had a standard system call for the equivalent of log level, early on!