Use case or problem
Add the ability to lock/unlock access to your vault with a password, and integration of Windows Hello features (fingerprint, facial recognition, etc..)
My idea is to add sub-vaults that can be freely turned on or off for each vault, and Obsidian will recognize the turned-on sub-vault as a folder. You can choose to encrypt a sub-vault, and the encrypted sub-vault remains closed; it will only be decrypted after entering a password each time Obsidian starts.