I LOVE Obsidian.
I LOVE Markdown.
But sometimes there are contexts where pure TeX makes more sense. E.g., a dedicated document-development vault. Markdown’s great flexibility in supporting LaTeX goes very far, and I remember reading somewhere that the vision/mission for Obsidian was very much anchored in sticking to the plaintext format with no format creep – and this makes sense. But perhaps a sister app? With the wonderfully-designed modularity of Obsidian, perhaps this sister ecosystem can, from a development perspective, be essentially an additional rendering module/layer extending the core Obsidian engine and so would avoid some parallel development headaches.