Code improved but no new features.
Quick tags that are deleted will have their commands and hotkeys persist until Obsidian is restarted or the plugin is disabled and re-enabled. This behaviour is intentional and user-friendly. If you accidentally delete a quick tag, you can still use its command until you restart Obsidian, giving you a chance to recreate the tag if needed.
There are ongoing developer discussions about dynamic command management in Obsidian plugins. I will monitor these discussions and may implement more dynamic command handling in a future release.