Formats supported

This discussion has been had many other places, and so far, LZMA (aka 7z) isn't unixy enough
to behave like we all expect gzip and bzip2 to behave.  Outputs and subarchiving, not to
mention magic numbers and crc, seem to be troublesome still.  It does what it does very well,
sure, but it doesn't do what gzip and bzip2 do well.

The other aspect is that of "sufficient improvement to outweigh transition costs".  Once it
behaves itself such that it can be a drop-in replacement for gzip or bzip2, the algorithm
speed and CPU efficiency will be no-brainer reasons to switch.  No workflow changes, IOW.

As your referenced email states, it's all about the tradeoffs and the conditions of use.  Look
up HPA on kernel binary compression formats.