Well, first of all, your source is the same author as the blog post. Second, a messy standard is still a standard.

And the biggest problem is by claiming it doesn't handle OOXML well, LibreOffice sabotages its own marketability. This blog is exactly what you write if you want to torpedo LibreOffice's success in the business environment.

You can not like Office or Office's file formats, but it's important to understand that it is table stakes for LibreOffice to promote how well it handles those formats and how safely it can be used as a replacement for Microsoft Office in an environment dominated by it.