HTML tags contain letters. Naturel Language words also contain letters. But markdown tags don't contain letters, and when reading, tags and words don't get mixed up.
Opportunity cost. I wrote on your forums about the decioson of using plain markdown. Consider other formats to stop bloating(yaml and dataview variables) markdown files. Now you have bloated md files and another format. Now i am saying you will add sqlite after one or two years. Waiting for extra file formats making existing files ugly.
Also obsidian needs multi user vaults. Start to think what extra file format needed for this.