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Open source has lots of efforts and bringong more attention to Open Office (or Libre office) is a great idea.
What parent means is OpenOffice is barely maintained (or no effort is put), not that it's worthless.
They also imply that LibreOffice is where the action is, and is better maintained with a bigger community.
I don't follow the projects to know if that's the case, but that's what the parent seems to mean, not that OpenOffice is not usable.