Main priority would be the editor itself to be similar to Obsidian (with links etc.) but maybe better, Obsidian is annoying for example when you edit a TODO list (which is 99% of the time for me), go to the beginning of the line, then press down to go to the next item -- Obsidian jumps into position between "- [ ] " and "item text", instead of staying at line beginning. Long story short, many small details to make this right.