Free and Open Source Software

It's the free software movement, though - the four freedoms are literally the cornerstone of the movement. They're not simply a "nice to have" they're the bare minimum of what we should ask for. If we promote non-free "alternatives" we are saying that these basic freedoms are not an expectation, but are optional and negotiable - we are moving the message away from the four freedoms and towards "evil" proprietary applications, while making exceptions for the "lesser evil" ones.

When I say Obsidian is non-free I am not saying Obsidian is evil or you are not allowed to use it. As non-free apps go Obsidian is probably one of the least-worst, as you and many others point out it is just a markdown editor so there is no vendor lock in or weird proprietary format. I am simply saying, this is a movement focused on "the four freedoms" and Obsidian does not meet those four very basic criteria.