Comments continue to be posted on articles that refer to blog posts on OOXML and related topics, from users who claim to support FOSS but in fact choose proprietary software, for reasons that have nothing to do with the support they claim to offer. These users share a preference for the proprietary OOXML document format and the Microsoft 365 ribbon interface, demonstrating on the one hand incompetence regarding formats and on the other hand subservience to proprietary marketing. Some of them even use the definition of “standard” for the ribbon interface, which in reality is neither a standard nor a good example of ergonomics. In reality, if ODF is LibreOffice’s first advantage from an open source perspective, the flexibility of the user interface is probably the second. Let’s start with an in-depth analysis of these two important advantages. Native support for the ODF format LibreOffice uses ODF as its native format rather than as a second choice, handled in an approximate manner with the aim of disqualifying ODF in the eyes of users, as Microsoft, OnlyOffice and WPS Office do. This means that documents are transferred perfectly without the risk of silent data loss, formatting corruption or schema compromise. Users