I have to cringe every time this article is brought up, because while xz does have made some questionable design choices, it practically works well and doesn't do anything fundamentally inadaquate as a compression file format [1]. And yet about a half of this article is devoted to the xz's inadaquateness as an archival format for which xz was never designed (use a properly designed archival format if you want). At this point lzip should be avoided because of this article. Sigh.

[1] Refers to file formats like .gz, .bz2 and of course .xz; doesn't include .tar, .zip or .7z.