Been a paying user of Dynalist but instead of moving to Obsidian decided to give https://logseq.com/ a try and I love it so far! Everything is pushed to my private Git repo.
Obsidian is closed source, and I’d say its features do not justify choosing that over Zettlr (unlike something like Notion.so)
Your approach is also kind of similar to Joplin (joplinapp.org), another open source, privacy-focused, and cross-device app, but you have more features.
Should be noted that the Core-Application is closed Source. The plugins are at the moment open source, or at least source available. I think the long term goal is to build on a rich plugin-ecosystem with a sleak core.
Also closed source doesn't really matter in this case, because it's build on open data-formats and running local. There is no vendor lockin. If the app disappears some day, you can still continue to use it or use a different markdown-editor (which are already existing today).