See our Internet-deployed social network from 13 years ago. Without any server and no gatekeepers. Its fully self-organising. It lacks polish. You simply can not compete against the thousands of engineers which polish the dominant social network. https://www.researchgate.net/publication/221015322_A_Gossip-...
Someone without advanced knowledge of the command line would not know how to start using twtxt, while using logseq is as simple as any plain text editor.
Logseq doesn't have "posts" as such, nor is there a protocol here for sharing. There's nothing graph related in twtxt. It also doesn't integrate with the personal knowledgebase people are already using. I'm not sure why twtxt would come to mind as similar.
https://twtxt.readthedocs.io/en/latest/user/twtxtfile.html
Since everything is just data, if you wanted to write a logseq query to transform and export your graph in this format to be compatible with their CLI, you could (especially with the new graph as api tools)
This is the most similar project I've seen to what I'm thinking https://anagora.org/agora-editor
Either: The author hasn't heard of twtxt, and might be intrigued at the possibility of compatibility, or they have heard of it and may have reasons for being different which may add to the discussion.
Your comment assumes the worst intent (I never said or suggested differences shouldn't be allowed) and deadends good discussion.